function validField(){	
	if (document.frmContact.txtName.value=="") 	{
		alert("Give us Name");
		document.frmContact.txtName.focus();
		return false;
	}

	if (IsEmail(document.frmContact.txtEmail.value)==false) 	{
			alert("Give us your E-mail");
			document.frmContact.txtEmail.focus();
			return false;
		}
	if (document.frmContact.txtMsg.value=="") 	{
		alert("Give us Messages");
		document.frmContact.txtMsg.focus();
		return false;
	}
}

function IsEmail(Expression)
{
	if (Expression == null)
		return (false);

	var supported = 0;
	if (window.RegExp)
	{
		var tempStr = "a";
		var tempReg = new RegExp(tempStr);
		if (tempReg.test(tempStr)) supported = 1;
	}
	if (!supported) 
		return (Expression.indexOf(".") > 2) && (Expression.indexOf("@") > 0);
	var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
	var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
	return (!r1.test(Expression) && r2.test(Expression));
}