Untitled

Margin: 0 auto not working IE?
<script type="text/javascript">
function validate_required(field,alerttxt)
{
with (field)
  {
  if (value==null||value=="")
    {
    alert(alerttxt);return false;
    }
  else
    {
    return true;
    }
  }
}
function validate_email(field,alerttxt)
{
with (field)
  {
  apos=value.indexOf("@");
  dotpos=value.lastIndexOf(".");
  if (apos<1||dotpos-apos<2)
    {alert(alerttxt);return false;}
  else {return true;}
  }
}
function validate_number(field,alerttxt)
{
with (field)
  {
  if (value != '11')
    {
    alert(alerttxt);return false;}
  else {return true;}
  }
}
function validate_form(thisform)
{
with (thisform)
  {
  if (validate_required(request_name,"Name must be filled out!")==false)
  {request_name.focus();return false;}
  if (validate_required(request_email,"Email address must be entered!")==false)
  {request_email.focus();return false;}
  if (validate_email(request_email,"Not a valid e-mail address!")==false)
    {request_email.focus();return false;}


  if (validate_number(request_number,"Not the correct answer for 7 + 4")==false)
    {request_number.focus();return false;}

  }
}
</script>

<!DOCTYPE html>