function isNum(arg)
{
	var args = arg;
	var fad = true;

	if (args == "" || args == null || args.length == 0)
	{
		return false;
	}

	args = args.toString();

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

function madd()
{
	var vva = document.first.a11.value;
	vva = vva.replace(' ','');
	var resul;
	var bb = true;
	if(vva != "")
	{
		resul = vva.split(",");
	}

	for(var v=0; v<resul.length; v++)
	{
		var d = resul[v];
		if(isNaN(d) || d == "")
		{
			alert("The number \""+d+"\" is not a valid one");
			var bb = false;
			break;
		}
	}

	if(bb == true)
	{
		var tot = resul.length;
		var mean=0;
		document.first.r1.value = tot;
	
		//Mean calculation
		for(var c=0; c<tot; c++)
		{
			mean = mean+parseFloat(resul[c]);
		}
		mean = mean/tot;
		var mean1 = Math.round(mean*100000)/100000;
		document.first.r2.value = mean1;	

		//Variance calculation
		var variance=0;
		var b;
		var varian;
		for(var a=0; a<tot; a++)
		{	
			variance = variance+Math.pow((parseFloat(resul[a])-mean),2);
			b = tot-1;
                  varian = variance/b; 
			var varian1 = Math.round(varian*100000)/100000;
		}
		document.first.r3.value = varian1;
		

		//Standard Deviation Calculation
		var sd=0;
		{
 			sd = Math.sqrt(varian);
			var sd1 = Math.round(sd*100000)/100000;
		}
		document.first.r4.value = sd1;

        	//Population Standard deviation
          	var pop = 0;
		{
			pop = variance/tot; 
			pop1 = Math.sqrt(pop); 
			var pop2 = Math.round(pop1*100000)/100000;
		}
		document.first.r5.value = pop2;
		//Variance Population Standard deviation
          	var varpop = 0;
		{
			varpop = variance/tot; 
			var varpop1 = Math.round(varpop*100000)/100000;
		}
		document.first.r6.value = varpop1;


	}
}


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;
}