<!--//
      function do_onloads() {
        preload_images();
      }
      if (document.images) {
        can_roll = true;
      }
      else {
        can_roll = false;
      }
      function preload_images() {
        PRELOADS = new Array();
        PRELOADS[0]  = 'images/menu_01_on.gif';
        PRELOADS[1]  = 'images/menu_02_on.gif';
        PRELOADS[2]  = 'images/menu_03_on.gif';
        PRELOADS[3]  = 'images/menu_04_on.gif';

        num_preloads = PRELOADS.length;
        for (idx = 0; idx < num_preloads; idx++) {
          eval('preload_'+idx+' = new Image();');
          eval('preload_'+idx+'.src = PRELOADS[idx]');
        }
      }
      function menu_on(id) {
        if (can_roll) {
          document.images[id].src = 'images/'+id+'_on.gif';
        }
      }
      function menu_off(id) {
        if (can_roll) {
          document.images[id].src = 'images/'+id+'.gif';
        }
      }
      function imgswap(id, file) {
        if (can_roll) {
          document.images[id].src = file;
        }
      }
    //-->