function isNum(args)
{
args = args.toString();

if (args.length == 0)
return false;

for (var i = 0;  i<args.length;  i++)
{
	if ((args.substring(i,i+1) < "0" || args.substring(i, i+1) > "9") && args.substring(i, i+1) != ".")
		{
		return false;
		}
}

return true;

}


function change(varr)
{
var aa = varr.value;

	if(isNum(aa))
	{
	
	}
	else
	{
		aa = aa.substring(0,aa.length-1);
		document.first.frac.value = aa;
	}
}

function hcfof(num1,num2)
{
	var firnum,secnum; 
	if(num1<num2)
	{
	 firnum = num1;
	 secnum = num2;
	}
	else
	{
	 firnum = num2;
	 secnum = num1;
	}
	
	var rem = (secnum%firnum);

	while(rem > 0)
	{
		secnum = firnum;
		firnum = rem;
		rem = (secnum%firnum);
	}
	
	var hcf = firnum;

	return hcf;
}


function calfrac()
{
var aa = document.first.frac.value;

	if(isNum(aa))
	{
	 aa=aa*1;
  	 var bb = Math.floor(aa);
	 var cc = aa-bb;
	
	 var dd = 1;	
	 if(cc != 0)
	 	dd = Math.pow(10,aa.toString().length-2);
	 var ee = Math.round(aa*dd);

	 document.first.t1.value = ee;
	 document.first.t2.value = dd;

	 var hcf = hcfof(ee,dd);
  	 ee = ee/hcf;
	 dd = dd/hcf;	
	 document.first.t3.value = ee;
	 document.first.t4.value = dd;
	}
	else{}
}


function color(test)
{

	for(var j=2; j<6; j++)
	{
		var myI=document.getElementsByTagName("input").item(j);
		myI.style.backgroundColor=test;
	
	}
}


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