function checnum(as)
{
	var a = as.value;
}

function per()
{
	var x1 = document.first.x1.value;
	var y1 = document.first.y1.value;
	var a = document.first.a.value;
	var b = document.first.b.value;
	var c = document.first.c.value;
	var aa = parseInt(x1*a) + parseInt(y1*b) + parseInt(c);
	var bb = parseInt(a*a) + parseInt(b*b);
	
	if(Math.round(Math.sqrt(bb)) == (Math.sqrt(bb)))
	{
		var xx = aa/Math.sqrt(bb);
	}
	else{
		var xx = aa + "/" + "sqrt(" + bb + ")";
	}
	
		
	document.first.r1.value = xx ;
}
	
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;
}