function contactchk()
{
	var doc=document.contactus;

	if(doc.username.value=="")
	{
		alert("Please enter name.");
		doc.username.focus();
		return false;
	}
	
	if(doc.email.value=="")
	{
		alert("Please enter your e-mail ID.");
		doc.email.focus();
		return false;
	}
	if(doc.email.value!="")
	{ 
		if(!isValidEmail(doc.email.value))
		{ 	   
			alert("Please enter valid e-mail ID.");
			doc.email.focus();
			return false;
		}
	}
	
	
	
	if(doc.msg.value=="")
	{
		alert("Please enter message.");
		doc.msg.focus();
		return false;
	}
	return true;
}