function validation()
	{
	if(document.f1.name.value=="")
	{
	alert("type your name");
	document.f1.name.focus();
	return false;
	}
	
var radio_choice = false;


for (counter = 0; counter <document.f1.r.length; counter++)
{

if (document.f1.r[counter].checked)
radio_choice = true; 
}

if (!radio_choice)
{

alert("Please select a letter.")
return (false);
}


	if(document.f1.w.value=="")
	{
	alert("select weight");
	document.f1.w.focus;
	return false;
	}
	if(isNaN(document.f1.w.value)==true)
	{
	alert("it should be a nemeric value");
	document.f1.w.focus();
	document.f1.w.value="";
	return false;
	}
	if(document.f1.h.value=="")
	{
	alert("select height");
	document.f1.h.focus;
	return false;
	}
	if(document.f1.a.value=="select")
	{
	alert("select age");
	document.f1.a.focus;
	return false;
	}
	return true;
	}
	function changecolor()
	{
	
	//alert("hello");
	alert(document.getElementById("m").className="calorie");
	}
	
	function changecolor1()
	{
	alert("female");
	document.getElementById("f").className="calorie1";
	}
	function value()
	{
		var weight=document.getElementById("w").value;
		alert(weight);
	}