function validate_login()
{
	
	if(document.getElementById("user_name").value=="")
	{
		//alert(document.getElementById("span_user_name"));
		document.getElementById("span_user_name").innerHTML = "This field is required.";
		return false;
	}
	if(document.getElementById("user_password").value=="")
	{
		document.getElementById("span_user_password").innerHTML = "This field is required.";
		return false;
	}	
	return true;
}