What John means is this:

In your form use

FORM ... onsubmit="return Validator(this)"

then in your form validation javascript use this:

function Validator(theForm)
{
  if (theForm.usr_first.value == "")
  {
    alert("Please enter a value for the \"First Name\" field.");
    theForm.usr_first.focus();
    return (false);
...
...

Nowhere is the name of the form being referenced, so it doesn't matter what the name of the form is.

-Dave