Is this what you want ?
<FORM NAME="form1" ACTION="script.php3" METHOD="POST">
Do you want to get the value of NAME (which is "form1") with PHP ? That is simply impossible ! The only way would be to send the name of the form in a hidden field :
<FORM NAME="form1" ACTION="script.php3" METHOD="POST">
<INPUT NAME="form_name" VALUE="form1" TYPE="HIDDEN">
...
</FORM>
I don't know if I answered the question. If no, don't be shy and ask again !