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(email,"Please include your e-mail address.")==false)
  {email.focus();submit.value ='Submit';return false}
if (validate_required(comments,"Please include your comments.")==false)
  {comments.focus();submit.value ='Submit';return false}
}
}