//--------function to check the registration form
function validate_fields()
{
 	if (document.frmcontact.txtname.value == "")
	{
		alert ("Please enter your name.");
		document.frmcontact.txtname.focus();
		return false;
	}
	var str=document.frmcontact.txtemail.value;
	if (str=="")
	{
		alert ("Please enter an email address.");
		document.frmcontact.txtemail.focus();
		return false;
	}
	else{
	var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
		if (!(filter.test(str) && str.length >= 6 && str.length <= 50)){
			alert("Please enter a valid email address. e.g user@gmail.com)");
			document.frmcontact.txtemail.focus();
			return false;
	    }
	}
	
	if (document.frmcontact.txtsub.value == "")
	{
		alert ("Please enter subject.");
		document.frmcontact.txtsub.focus();
		return false;
	}

	if (document.frmcontact.txtmsg.value == "")
	{
		alert ("Please enter your message.");
		document.frmcontact.txtmsg.focus();
		return false;
	}
return true;
}