function emailCheck (entered) 
{
	var re_email=/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,})+$/;

	if(re_email.test(entered.value))
	{
	}
	else 
	{
		entered.value="";
		alert("Invalid or blank email ID is not allowed. Please specify a valid email ID so hat we can respond to you.");
	}
}