function echeck(str) 
{
	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
	   return false
	}
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){   
	   return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){		
		return false
	}

	 if (str.indexOf(at,(lat+1))!=-1){
		return false
	 }
	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		return false
	 }
	 if (str.indexOf(dot,(lat+2))==-1){
		return false
	 }
	 if (str.indexOf(" ")!=-1){
		return false
	 }
	 return true					
}

function Validation()
{
	if(document.getElementById('name').value=="")
	{
		alert("Please enter your name");
		document.getElementById('name').focus();
		return false;
	}
	if(document.getElementById('email').value=="")
	{
		alert("Please enter your email address");
		document.getElementById('email').focus();
		return false;
	}
	if(!(echeck(document.getElementById('email').value)))
	{
		alert("The given email address is invalid. Please enter correct email address like name@domain.com");
		document.getElementById('email').focus();
		return (false);
	}
	if(document.getElementById('select').value=="")
	{
		alert("Please select referer");
		document.getElementById('select').focus();
		return false;
	}
	if(document.getElementById('comments').value=="")
	{
		alert("Please enter your comments");
		document.getElementById('comments').focus();
		return false;
	}
	return true;
}