function CheckValidation(frm)
{
	if(frm.Username.value==""){
			alert("Field required: Username.");
			frm.Username.focus();
			return false;
		}
		
		if(frm.Password.value==""){
			alert("Field required: Password.");
			frm.Password.focus();
			return false;
		}
		
		if(frm.Username.value!="" || frm.Password.value!=""){
			alert('Username and password do not match.');
		}
}