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 check(df)
{
	var ad = df.value;
	if(!isNum(ad))
	{
		if(ad != "")
			ad = ad.substring(0,ad.length-1);

		df.value = ad;
	}
}

function madd()
{
	var a11 = document.first.a11.value;
	var a12 = document.first.a12.value;
	var a13 = document.first.a13.value;
	var a21 = document.first.a21.value;
	var a22 = document.first.a22.value;
	var a23 = document.first.a23.value;
	var a31 = document.first.a31.value;
	var a32 = document.first.a32.value;
	var a33 = document.first.a33.value;

	var b11 = document.first.b11.value;
	var b12 = document.first.b12.value;
	var b13 = document.first.b13.value;
	var b21 = document.first.b21.value;
	var b22 = document.first.b22.value;
	var b23 = document.first.b23.value;
	var b31 = document.first.b31.value;
	var b32 = document.first.b32.value;
	var b33 = document.first.b33.value;

	if( a11 == "" || a21 == "" || a31 == "" || a21 == "" || a22 == "" || a23 == "" || a31 == "" || a32 == "" || a33 == "" || 
 b11 == "" || b21 == "" || b31 == "" || b21 == "" || b22 == "" || b23 == "" || b31 == "" || b32 == "" || b33 == "") 
	{
		alert("Empty cells are present. Please fill proper values");
	}
	else
	{
		aa11 = a11+"-"+b11;
		aa12 = a12+"-"+b12;
		aa13 = a13+"-"+b13;
		aa21 = a21+"-"+b21;
		aa22 = a22+"-"+b22;
		aa23 = a23+"-"+b23;
		aa31 = a31+"-"+b31;
		aa32 = a32+"-"+b32;
		aa33 = a33+"-"+b33;
		document.first.aa11.value = aa11;
		document.first.aa12.value = aa12;
		document.first.aa13.value = aa13;
		document.first.aa21.value = aa21;
		document.first.aa22.value = aa22;
		document.first.aa23.value = aa23;
		document.first.aa31.value = aa31;
		document.first.aa32.value = aa32;
		document.first.aa33.value = aa33;

		document.first.ba11.value = eval(aa11);
		document.first.ba12.value = eval(aa12);
		document.first.ba13.value = eval(aa13);
		document.first.ba21.value = eval(aa21);
		document.first.ba22.value = eval(aa22);
		document.first.ba23.value = eval(aa23);
		document.first.ba31.value = eval(aa31);
		document.first.ba32.value = eval(aa32);
		document.first.ba33.value = eval(aa33);
	}
}


function color(test)
{
var cn =document.getElementsByTagName("input");
cn = cn.length;

	for(var j=19; j<37; 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;
}