function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);return false;}
else {return true}
}
}function validate_form(thisform)
{
with (thisform)
{
if (validate_required(FirstName,"Please enter your first name!")==false)
  {FirstName.focus();return false;}
  if (validate_required(LastName,"Please enter your last name!")==false)
  {FirstName.focus();return false;}
  if (validate_required(email,"Please enter your email address!")==false)
  {email.focus();return false;}
  if (validate_required(feedback,"Please provide your feedback \n or comments!")==false)
  {feedback.focus();return false;}

}
}