<script language="JavaScript" type="text/javascript">
 <!--
 function trimNumber(s) {
   while (s.substr(0,1) == '0' && s.length>1) { s = s.substr(1,9999); }
   return s;
 }
 
 var s = '00123';
 alert(s + '=' + trimNumber(s));
 
 // end hiding contents -->
</script>