// Thermochemistry - Hess' Law JavaScript
thepage="Thermochemistry - Hess' Law"
//11/20/02-updated netscape 7
choice=-1
//refnumber=100
attempts=0
preamble="Use the thermochemical equations shown below to determine<br>the enthalpy for the final reaction:<br>"
spaceit="       ";
//global variables
reactset=""
tried=0
totl=0
corrt=0
thesolution=0
problem=""
adjust=theheat=0
theat=0
missing=0
function reaction(reagents,products,heat,factor){
	this.reagents=reagents
	this.products=products
	this.heat=heat
	this.factor=factor
}
thefactor=new Array(.6,.8,1,1.2,1.4)
set=new Array()
couples=new Array()
linkset=new Array()
linkset[0]=new Array()
linkset[0][0]=new Array(-1,-1,1)
linkset[0][1]=new Array(-1,-1,1)
linkset[0][2]=new Array(-1,-1,1)
linkset[0][3]=new Array(1,1,1)
linkset[1]=new Array()
linkset[1][0]=new Array(-1,1)
linkset[1][1]=new Array(-1,1)
linkset[1][2]=new Array(1,1)
linklist=new Array(0,0,0,1,0)
set[0]=new Array()
set[0][0]=new reaction("3CO<SUB>2</SUB> + 4 H<SUB>2</SUB>O(l)","C<SUB>3</SUB>H<SUB>8</SUB>(g) + 5O<SUB>2</SUB>(g)",2220,1)
set[0][1]=new reaction("C(graphite) + O<SUB>2</SUB>","CO<SUB>2</SUB>",-394,3)
set[0][2]=new reaction("H<SUB>2</SUB>(g)  + 1/2O<SUB>2</SUB>(g)","H<SUB>2</SUB>O(l)",-285,4)
set[0][3]=new reaction("3C(graphite) + 4H<SUB>2</SUB>(g)","C<SUB>3</SUB>H<SUB>8</SUB>(g)",-104,1)
couples[0]=new Array()
couples[0][0]=new Array(-1,-1,1)
couples[0][1]=new Array(-1,-1,1)
couples[0][2]=new Array(-1,-1,1)
couples[0][3]=new Array(1,1,1)
//
set[1]=new Array()
set[1][0]=new reaction("Fe<SUB>2</SUB>O<SUB>3</SUB>(s) + 3CO(g)","2Fe(s) +  3CO<SUB>2</SUB>(g)",-23,.5)
set[1][1]=new reaction("2Fe<SUB>3</SUB>O<SUB>4</SUB>(s) +  CO<SUB>2</SUB>(g)","3Fe<SUB>2</SUB>O<SUB>3</SUB>(s)  +  CO(g)",39,.167)
set[1][2]=new reaction("3FeO(s) +  CO<SUB>2</SUB>(g)","Fe<SUB>3</SUB>O<SUB>4</SUB>  +  CO(g)",18,.33)
set[1][3]=new reaction("FeO(s)  +  CO(g)","Fe(s)  +  CO<SUB>2</SUB>(g)",1,1)
couples[1]=new Array()
couples[1][0]=new Array(-1,-1,1)
couples[1][1]=new Array(-1,-1,1)
couples[1][2]=new Array(-1,-1,1)
couples[1][3]=new Array(1,1,1)
//
set[2]=new Array()
set[2][0]=new reaction("N<SUB>2</SUB>(g)  +  2O<SUB>2</SUB>(g)","2NO<SUB>2</SUB>(g)",67.8,1)
set[2][1]=new reaction("N<SUB>2</SUB>O<SUB>4</SUB>(g)","N<SUB>2</SUB>(g)  +  2O<SUB>2</SUB>(g)",-9.6,1)
set[2][2]=new reaction("N<SUB>2</SUB>O<SUB>4</SUB>(g)","2NO<SUB>2</SUB>(g)",58.2,1)
couples[2]=new Array()
couples[2][0]=new Array(-1,1)
couples[2][1]=new Array(-1,1)
couples[2][2]=new Array(1,1)
//
set[3]=new Array()
set[3][0]=new reaction("cis-C<SUB>4</SUB>H<SUB>8</SUB>(g)  +  6O<SUB>2</SUB>(g)","4CO<SUB>2</SUB>(g) + 4H<SUB>2</SUB>O(g)",-2711,1)
set[3][1]=new reaction("4CO<SUB>2</SUB>(g) + 4H<SUB>2</SUB>O(g)","trans-C<SUB>4</SUB>H<SUB>8</SUB>(g)  +  6O<SUB>2</SUB>(g)",2707,1)
set[3][2]=new reaction("cis-C<SUB>4</SUB>H<SUB>8</SUB>(g) ","trans-C<SUB>4</SUB>H<SUB>8</SUB>(g)",-4 ,1)
couples[3]=new Array()
couples[3][0]=new Array(-1,1)
couples[3][1]=new Array(-1,1)
couples[3][2]=new Array(1,1)
//
set[4]=new Array()
set[4][0]=new reaction("C(s) +  O<SUB>2</SUB>(g)","CO<SUB>2</SUB>(g)",-393.5,1)
set[4][1]=new reaction("H<SUB>2</SUB>(g)  +  1/2O<SUB>2</SUB>(g)","H<SUB>2</SUB>O(l)",-285.8,2)
set[4][2]=new reaction("CO<SUB>2</SUB>(g) +  2H<SUB>2</SUB>O(l)","CH<SUB>4</SUB>(g) + 2O<SUB>2</SUB>(g)",890.5,1)
set[4][3]=new reaction("C(s) +  2H<SUB>2</SUB>(g)","CH<SUB>4</SUB>(g)",-74.8,1)
couples[4]=new Array()
couples[4][0]=new Array(-1,-1,1)
couples[4][1]=new Array(-1,-1,1)
couples[4][2]=new Array(-1,-1,1)
couples[4][3]=new Array(1,1,1)
//
set[5]=new Array()
set[5][0]=new reaction("C(s) +  O<SUB>2</SUB>(g)","CO<SUB>2</SUB>(g)",-393.5,2)
set[5][1]=new reaction("H<SUB>2</SUB>(g)  +  1/2O<SUB>2</SUB>(g)","H<SUB>2</SUB>O(l)",-285.8,3)
set[5][2]=new reaction("C<SUB>2</SUB>H<SUB>6</SUB>(g)","2C(s) +  3H<SUB>2</SUB>(g)",84.7,1)
set[5][3]=new reaction("C<SUB>2</SUB>H<SUB>6</SUB>(g) + 7/2O<SUB>2</SUB>(g)","2CO<SUB>2</SUB>(g) +  3H<SUB>2</SUB>O(l)",-1560.5,1)
couples[5]=new Array()
couples[5][0]=new Array(-1,-1,1)
couples[5][1]=new Array(-1,-1,1)
couples[5][2]=new Array(-1,-1,1)
couples[5][3]=new Array(1,1,1)
//
set[6]=new Array()
set[6][0]=new reaction("4PCl<SUB>3</SUB>(g)","P<SUB>4</SUB>(s)  +  6Cl<SUB>2</SUB>(g)",1084,.25)
set[6][1]=new reaction("P<SUB>4</SUB>(s)  +  10Cl<SUB>2</SUB>(g)","4PCl<SUB>5</SUB>(g)",-1528,.25)
set[6][2]=new reaction("PCl<SUB>3</SUB>(g)  +  Cl<SUB>2</SUB>(g)","PCl<SUB>5</SUB>(g)",-111,1)
couples[6]=new Array()
couples[6][0]=new Array(-1,1)
couples[6][1]=new Array(-1,1)
couples[6][2]=new Array(1,1)
//
set[7]=new Array()
set[7][0]=new reaction("2CO<SUB>2</SUB>(g) +  2H<SUB>2</SUB>O(l)","CH<SUB>3</SUB>COOH(l)  +  2O<SUB>2</SUB>(g)",871,1)
set[7][1]=new reaction("C(graphite) +  O<SUB>2</SUB>(g)","CO<SUB>2</SUB>(g)",-394,2)
set[7][2]=new reaction("2H<SUB>2</SUB>(g) +  O<SUB>2</SUB>(g)","2H<SUB>2</SUB>O(l)",-572,1)
set[7][3]=new reaction("2C(graphite)  +  2H<SUB>2</SUB>(g)  +  O<SUB>2</SUB>(g)","CH<SUB>3</SUB>COOH(l)",-489,1)
couples[7]=new Array()
couples[7][0]=new Array(-1,-1,1)
couples[7][1]=new Array(-1,-1,1)
couples[7][2]=new Array(-1,-1,1)
couples[7][3]=new Array(1,1,1)
//
set[8]=new Array()
set[8][0]=new reaction("3Fe<SUB>2</SUB>O<SUB>3</SUB>(s)","2Fe<SUB>3</SUB>O<SUB>4</SUB>(s)  +  1/2O<SUB>2</SUB>(g)",232.2,1)
set[8][1]=new reaction("6Fe(s) +  9/2O<SUB>2</SUB>(g)","3Fe<SUB>2</SUB>O<SUB>3</SUB>(s)",-2466.5,1)
set[8][2]=new reaction("6Fe(s)  +  4O<SUB>2</SUB>(g)","2Fe<SUB>3</SUB>O<SUB>4</SUB>(s)",-2234,1)
couples[8]=new Array()
couples[8][0]=new Array(-1,1)
couples[8][1]=new Array(-1,1)
couples[8][2]=new Array(1,1)
//
set[9]=new Array()
set[9][0]=new reaction("ZnO  +  CO<SUB>2</SUB>","ZnCO<SUB>3</SUB>",-17.2,1)
set[9][1]=new reaction("H<SUB>2</SUB>CO<SUB>3</SUB>","H<SUB>2</SUB>O  +  CO<SUB>2</SUB>",62,1)
set[9][2]=new reaction("Zn(OH)<SUB>2</SUB>","ZnO  +  H<SUB>2</SUB>O",72,1)
set[9][3]=new reaction("Zn(OH)<SUB>2</SUB>  +  H<SUB>2</SUB>CO<SUB>3</SUB>","2H<SUB>2</SUB>O  +  ZnCO<SUB>3</SUB>",117,1)
couples[9]=new Array()
couples[9][0]=new Array(-1,-1,1)
couples[9][1]=new Array(-1,-1,1)
couples[9][2]=new Array(-1,-1,1)
couples[9][3]=new Array(1,1,1)

//
set[10]=new Array()
set[10][0]=new reaction("2C<SUB>2</SUB>H<SUB>4</SUB>O(l) + 2H<SUB>2</SUB>O(l)","2C<SUB>2</SUB>H<SUB>6</SUB>O(l) +  O<SUB>2</SUB>(g)",407,.5)
set[10][1]=new reaction("C<SUB>2</SUB>H<SUB>6</SUB>O(l)  +  3O<SUb>2</SUb>(g)","2CO<SUB>2</SUB>(g)  +  3H<SUB>2</SUB>O(l)",-1371,1)
set[10][2]=new reaction("C<SUB>2</SUB>H<SUB>4</SUB>O(l)  +  5/2O<SUB>2</SUB>(g)","2CO<SUB>2</SUB>(g)  +  2H<SUB>2</SUB>O(g)",-1167,1)
couples[10]=new Array()
couples[10][0]=new Array(-1,1)
couples[10][1]=new Array(-1,1)
couples[10][2]=new Array(1,1)
//
set[11]=new Array()
set[11][0]=new reaction("C<SUB>2</SUB>H<SUB>6</SUB>(g)","C<SUB>2</SUB>H<SUB>2</SUB>(g) + 2H<SUB>2</SUB>(g)",378,1)
set[11][1]=new reaction("C<SUB>2</SUB>H<SUB>2</SUB>(g) +  5/2O<SUB>2</SUB>(g)","2CO<SUB>2</SUB>(g)  +  H<SUB>2</SUB>O(g)",-940,1)
set[11][2]=new reaction("H<SUB>2</SUB>(g) + 1/2O<SUB>2</SUB>(g)","H<SUB>2</SUB>O(g)",-285,2)
set[11][3]=new reaction("C<SUB>2</SUB>H<SUB>6</SUB>(g) +  7/2O<SUB>2</SUB>(g)","2CO<SUB>2</SUB>(g)  +  3H<SUB>2</SUB>O(g)",-1132,1)
couples[11]=new Array()
couples[11][0]=new Array(-1,-1,1)
couples[11][1]=new Array(-1,-1,1)
couples[11][2]=new Array(-1,-1,1)
couples[11][3]=new Array(1,1,1)
//
set[12]=new Array()
set[12][0]=new reaction("N<SUB>2</SUB>H<SUB>4</SUB>(l)  +  CH<SUB>4</SUB>O(l)","CH<SUB>2</SUB>O(g)  +  N<SUB>2</SUB>(g)  +  3H<SUB>2</SUB>(g)",-74,1)
set[12][1]=new reaction("2NH<SUB>3</SUB>(g)","N<SUB>2</SUB>H<SUB>4</SUB>(l)  +  H<SUB>2</SUB>(g)",36,1)
set[12][2]=new reaction("N<SUB>2</SUB>(g)  +  3H<SUB>2</SUB>(g)","2NH<SUB>3</SUB>(g)",-92,1)


set[12][3]=new reaction("CH<SUB>4</SUB>O(l)","CH<SUB>2</SUB>O(g) +  H<SUB>2</SUB>(g)",-130,1)
couples[12]=new Array()
couples[12][0]=new Array(-1,-1,1)
couples[12][1]=new Array(-1,-1,1)
couples[12][2]=new Array(-1,-1,1)
couples[12][3]=new Array(1,1,1)
//
set[13]=new Array()
set[13][0]=new reaction("N<SUB>2</SUB>(g)  +  3H<SUB>2</SUB>(g)","2NH<SUB>3</SUB>(g)",-92,.5)
set[13][1]=new reaction("2H<SUB>2</SUB>O(l)  +  NH<SUB>3</SUB>(g)","NO<SUB>2</SUB>(g)  +  7/2H<SUB>2</SUB>(g)",216,1)
set[13][2]=new reaction("1/2N<SUB>2</SUB>(g) +  2H<SUB>2</SUB>0(l)","NO<SUB>2</SUB>(g)  +  2H<SUB>2</SUB>(g)",170,1)
couples[13]=new Array()
couples[13][0]=new Array(-1,1)
couples[13][1]=new Array(-1,1)
couples[13][2]=new Array(1,1)
//
set[14]=new Array()
set[14][0]=new reaction("N<SUB>2</SUB>(g)  +  3H<SUB>2</SUB>(g)","2NH<SUB>3</SUB>(g)",-92,.25)
set[14][1]=new reaction("2NH<SUB>3</SUB>(g)  +  4H<SUB>2</SUB>O(l)","2NO<SUB>2</SUB>(g)  +  7H<SUB>2</SUB>(g)",-114,.25)
set[14][2]=new reaction("2NO<SUB>2</SUB>(g)","N<SUB>2</SUB>(g) +  2O<SUB>2</SUB>(g)",66,.25)
set[14][3]=new reaction("H<SUB>2</SUB>O(l)","H<SUB>2</SUB>(g)  +  1/2O<SUB>2</SUB>(g)",-35,1)
couples[14]=new Array()
couples[14][0]=new Array(-1,-1,1)
couples[14][1]=new Array(-1,-1,1)
couples[14][2]=new Array(-1,-1,1)
couples[14][3]=new Array(1,1,1)
//
set[15]=new Array()
set[15][0]=new reaction("H<SUB>2</SUB>S(g)  +  3/2O<SUB>2</SUB>(g)","H<SUB>2</SUB>SO<SUB>3</SUB>(l)",-204,1)
set[15][1]=new reaction("H<SUB>2</SUB>SO<SUB>3</SUB>(l)","H<SUB>2</SUB>O(l)  +SO<SUB>2</SUB>(g)",62,1)
set[15][2]=new reaction("SO<SUB>2</SUB>(g)","S(s)  +  O<SUB>2</SUB>(g)",297,1)
set[15][3]=new reaction("H<SUB>2</SUB>S(g) +  1/2O<SUB>2</SUB>(g)","S(s)  +   H<SUB>2</SUB>O(l)",155,1)
couples[15]=new Array()
couples[15][0]=new Array(-1,-1,1)
couples[15][1]=new Array(-1,-1,1)
couples[15][2]=new Array(-1,-1,1)
couples[15][3]=new Array(1,1,1)
//
set[16]=new Array()
set[16][0]=new reaction("CH<SUB>2</SUB>Cl<SUB>2</SUB>(l)  +  O<SUB>2</SUB>(g)","COCl<SUB>2</SUB>(g)  +  H<SUB>2</SUB>O(g)",-19,1)
set[16][1]=new reaction("1/2H<SUB>2</SUB>(g)  +  1/2Cl<SUB>2</SUB>(g)","HCl(g)",-92,2)
set[16][2]=new reaction("2HCl(g)  +  1/2O<SUB>2</SUB>(g)","H<SUB>2</SUB>O(g)  +  Cl<SUB>2</SUB>(g)",42,1)
set[16][3]=new reaction("CH<SUB>2</SUB>Cl<SUB>2</SUB>(l) +  H<SUB>2</SUB>(g)  +  3/2O<SUB>2</SUB>(g)","COCl<SUB>2</SUB>(g)  +  2H<SUb>2</SUb>O(g)",-161,1)
couples[16]=new Array()
couples[16][0]=new Array(-1,-1,1)
couples[16][1]=new Array(-1,-1,1)
couples[16][2]=new Array(-1,-1,1)
couples[16][3]=new Array(1,1,1)
//
set[17]=new Array()
set[17][0]=new reaction("H<SUB>2</SUB>S(g)  +  2O<SUB>2</SUB>(g)","H<SUB>2</SUB>SO<SUB>4</SUB>(l)",-314,1)
set[17][1]=new reaction("H<SUB>2</SUB>SO<SUB>4</SUB>(l)","SO<SUB>3</SUB>(g)  +  H<SUB>2</SUB>O(g)",82,1)
set[17][2]=new reaction("SO<SUB>3</SUB>(g)  +  H<SUB>2</SUB>O(l)","H<SUB>2</SUB>S(g)  +  2O<SUB>2</SUB>(g)",276,1)
set[17][3]=new reaction("H<SUB>2</SUB>O(l)","H<SUB>2</SUB>O(g)",44,1)
couples[17]=new Array()
couples[17][0]=new Array(-1,-1,1)
couples[17][1]=new Array(-1,-1,1)
couples[17][2]=new Array(-1,-1,1)
couples[17][3]=new Array(1,1,1)
//
set[18]=new Array()
set[18][0]=new reaction("H<SUB>2</SUB>CO<SUB>3</SUB>","H<SUB>2</SUB>O  +  CO<SUB>2</SUB>",62,1)
set[18][1]=new reaction("H<SUB>2</SUB>CO +  O<SUB>2</SUB>","H<SUB>2</SUB>CO<SUB>3</SUB>",-112,1)
set[18][2]=new reaction("H<SUB>2</SUB>CO  +  O<SUB>2</SUB>","H<SUB>2</SUB>O  +  CO<SUB>2</SUB>",-50,1)
couples[18]=new Array()
couples[18][0]=new Array(-1,1)
couples[18][1]=new Array(-1,1)
couples[18][2]=new Array(1,1)
//
/*
set[9]=new Array()
set[9][0]=new reaction("2N<SUB>2</SUB>H<SUB>4</SUB>(l)  +  2O<SUB>2</SUB>(g)","2N<SUB>2</SUB>(g)  +  4H<SUB>2</SUB>O(g)",-1245,-.25)
set[9][1]=new reaction("2NH<SUB>3</SUB>(g) +  3N<SUB>2</SUB>O(g)","4N<SUB>2</SUB>(g) + 1/2O<SUB>2</SUB>(g)",-1011,.33)
set[9][2]=new reaction("H<SUB>2</SUB>O(l) + N<SUB>2</SUB>H<SUB>4</SUB>(l)","2NH<SUB>3</SUB>(g) +  1/2O<SUB>2</SUB>(g)",143,.33)
set[9][3]=new reaction("N<SUB>2</SUB>O(g)  +  3H<SUB>2</SUB>(g)","N<SUB>2</SUB>H<SUB>4</SUB>(l)  +  H<SUB>2</SUB>O(l)",-317,.33)
set[9][4]=new reaction("H<SUB>2</SUB>(g)  +  1/2O<SUB>2</SUB>(g)","H<SUB>2</SUB>O(g)",-286,1)
*/
function screenit(){
	choice++
	thequest=""
	document.forms[0].total.value=choice
	reactset=new Array()
	for(var g=0;g<set[choice].length;g++){reactset[g]=set[choice][g].reagents+" &#8594; "+set[choice][g].products+";  q = "+set[choice][g].heat+" <b>kJ</b>"
	thequest+=reactset[g]+"<br>"
	}
	showquest()
}
function startit(){
	clear()
	totl++
	document.forms[0].total.value=totl
	//choice=Math.floor(Math.random()*set.length)
	choice++
	reactset=new Array()
	theat=0
	adjust=new Array()
	theheat=new Array()
	fchoice=Math.floor(5*Math.random())
	for(var g=0;g<set[choice].length;g++){
	adjust[g]=set[choice][g].factor
	theheat[g]=Math.round(thefactor[fchoice]*set[choice][g].heat)
	if(Math.random()>.5)reactset[g]=set[choice][g].reagents+" &#8594; "+set[choice][g].products;
	else{ reactset[g]=set[choice][g].products+" &#8594; "+set[choice][g].reagents
	adjust[g]=-1*adjust[g]
	theheat[g]=-theheat[g]
	}
	reactset[g]+=";  q = "+theheat[g]+" <b>kJ</b>"
	}
	missing=Math.floor(reactset.length*Math.random())
	if(adjust[missing]==set[choice][missing].factor){
		reactset[missing]=set[choice][missing].reagents+" &#8594; "+set[choice][missing].products+";  q = ?";
	}
	else{
	reactset[missing]=set[choice][missing].products+" &#8594; "+set[choice][missing].reagents+";  q = ?";
	}	
	buildquest()
}
function buildquest(){
	thequest=preamble
	count=1
	for(var g=0;g<reactset.length;g++)if(g!=missing)thequest+="(<b>"+count++ +"</b>) "+reactset[g]+"<br>";
	thequest+=reactset[missing]
	showquest(thequest)
	buildanswer()
}
function buildanswer(){
	heatcheck=0
	ansset=new Array()
	g=0
	theindex=linklist[reactset.length]
	for(k=0;k<reactset.length;k++){
		if(k==missing)k++;
		if(k<reactset.length){
		ansset[g]=new Array()
		ansset[g][0]=g+1;
		if(linkset[theindex][missing][g]*adjust[k]*adjust[missing]>0)ansset[g][1]="No Change";
		else ansset[g][1]="Reverse";
		ansset[g][4]=linkset[theindex][missing][g]*adjust[k]*adjust[missing]
		ansset[g][2]="*"+adjusted(Math.abs(adjust[k]),Math.abs(adjust[missing]))
		if(ansset[g][1]=="Reverse")theheat[k]=-theheat[k];
		ansset[g][3]=Math.round(Math.abs(adjust[k])*theheat[k]/Math.abs(adjust[missing]))
		heatcheck+=ansset[g][3]
		g++
	}}
	thetable=buildtable(ansset,heatcheck)
	theanswer="The table below presents the solution."+thetable+"Key:<br><B>Direction</B>: <B>No Change</B>: reaction proceeds as written; <B>Reverse</B>: reverse the reaction <br><B>Quantity</B>: factor the reaction and q are multiplied by <br><B>Heat</B>: resultant q for each contributor and the needed q "
	theanswr=heatcheck
}
function adjusted(x,y){
	mfactor=""
	if(x==y)mfactor="1";
	else{
		if(x<y)mfactor="1/"+Math.round(y/x);
		if(x>y)mfactor=Math.round(x/y);	
	}
	if(x>y & x%y>.2)mfactor=x+"/"+y;
	if(y>x & y%x>.2)mfactor=x+"/"+y;
	//alert(x+","+y+","+mfactor)
	return mfactor
}			
function buildtable(ansset,heatcheck){
	thetable="<table><tr><th>Reaction</th><th>Direction</th><th>Quantity</th><th>Heat</th></tr>"
	for(var j=0;j<ansset.length;j++){thetable+="<tr><td>"+(j+1)+"</td>"
		for(var k=1;k<4;k++)thetable+="<td>"+ansset[j][k]+"</td>";
		thetable+="</tr>"
	}
	thetable+="<tr><td class='blank'></td><td class='blank'></td><td>Total</td><td>"+heatcheck+"</td></tr>"
	thetable+="</table>"
	return thetable
}
	
function answer(val){
	attempts++
	if(tried==1){alert("You've already done this problem. Get a new one!")}
	else{kk=0
	if(tried==2){totl++;document.forms[0].total.value=totl}
	if(theanswr<0){
		if(val>1.05*theanswr & val<.95*theanswr){
    		kk=1}}
	else{
		if(val<1.05*theanswr & val>.95*theanswr){
    	kk=1}
	}
	if(kk==1){
    		document.forms[0].results.value="Correct"
    		corrt++
    		document.forms[0].correct.value=corrt
    		tried=1
	}
	else{
    		tried=2
    	document.forms[0].results.value="Incorrect"}
	}	
}