function checnum(as)
{
	var dd = as.value;
	
	if(isNaN(dd))
	{
		dd = dd.substring(0,(dd.length-1));
		as.value = dd;
	}		
}

function loan()
{
	var monpay = document.first.aa.value;
	var b = document.first.bb.value;
	var c = document.first.cc.value;
	var d = document.first.dd.value;
	var oldtot = monpay*c*12;
	for(var ea=1; ea<4; ea++){
		var c = (d * eval("document.first.c"+ea).value)/100;
		eval("document.first.d"+ea).value=c;
		var n = eval("document.first.b"+ea).value * 12;
		var r = eval("document.first.a"+ea).value/(12*100);
		var p = (d * r *Math.pow((1+r),n))/(Math.pow((1+r),n)-1);
		var prin = Math.round(p*1000)/1000;
		eval("document.first.e"+ea).value=prin;
		var z=Math.round((monpay-prin)*1000)/1000;
		eval("document.first.f"+ea).value=z;
		var curtot = eval("document.first.e"+ea).value * eval("document.first.b"+ea).value * 12;
		//alert(curtot);
		var tot = Math.round((oldtot-curtot)*100)/100;
		eval("document.first.g"+ea).value=tot;

	}

}
	
		


function color(test)
{

	for(var j=2; j<10; j++)
	{
		var myI=document.getElementsByTagName("input").item(j);
		//myI.setAttribute("style",ch);
		myI.style.backgroundColor=test;
	}
}


function color1(test)
{
var myI=document.getElementsByTagName("table").item(0);
//myI.setAttribute("style",ch);
myI.style.backgroundColor=test;
}