function checnum(as)
{
	//alert("*********");
	var a = as.value;
	for(var x=0; x<a.length; x++)
	{
		var ff = a[x];
	
		if(isNaN(ff) && ff != "/")
		{
			alert("Enter a proper value");
			break;
		}
	}
}

function slope()
{
	var x1 = document.first.x1.value;
	var y1 = document.first.y1.value;
	var m = document.first.m.value;
	if(m.indexOf("/")!=-1){
		var q = m.split("/");
		if(q[1].indexOf("-")!=-1)
		{
			q[0] = -(q[0]);
			q[1] = -(q[1]);
		}
		var a = q[0] + "x ";
		var b = -(q[1]) + "y ";
		var c = -(q[0] * (parseInt(x1))) + (q[1] * (parseInt(y1)));
	}
	else{
		var a = m + "x ";
		var b = "-y ";
		var c = -(m * (parseInt(x1))) + parseInt(y1);
	}
	if(c>0)
		c="+ " + c;
	document.first.r1.value = a + b + c;
}
	
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;
}