on (release) {
       a = "a.html#flag";
       getURL(a, "_self");
}

on (release) {
       a = escape("a.html#flag");
       getURL(a, "_self");
}

on (release) {
    fscommand("anchor","#flag");
}

<script language=javascript>
          function button_DoFSCommand(command,args)
          {if(command == "anchor"){
          window.location.href=args;}
          }
</script>
<SCRIPT LANGUAGE=VBScript>
          Sub button_FSCommand(ByVal command, ByVal args)
          call button_DoFSCommand(command, args)
          end sub
</SCRIPT>