<form enctype="multipart/form-data" action="myscript.pl" method=post>
 
 <script type="text/javascript" language="JavaScript">
 <!--
 function file_onchange() {
   var s=document.getElementById('userfile').value;
   var r=s.lastIndexOf('/');
   if (r<0) {
     r=s.lastIndexOf('\\\\');
   }
   if (r>=0) {
     s=s.substr(r+1);
   }
   document.getElementById('remotename').value=s;
 }
 -->
 </script>
 
 <input type=file name=userfile id=userfile onChange="file_onchange()">
 <br>
 <input type=hidden name=remotename id=remotename>
 
 <input type=submit value="send file">
 </form>