/** Form Validation Function **/
function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);return false;}
else {return true}
}
}

function validate_email(thisform) {
with (thisform) {
if (validate_required(email,"Please enter your email.")==false)
  {email.focus();return false;}
}
}