function init_dw_Scroll() {
   var wndo = new dw_scrollObj('topScrollWindow', 'lyr1', 't1');
   wndo.setUpScrollbar('dragBar_top', 'track_top', 'h', 0, 2, 72);
   wndo.setUpScrollControls('topScrollBar');
}

// if necessary objects exists link in the style sheet and call the init function onload
if (document.getElementById && document.getElementsByTagName ) {
    addLoadEvent(init_dw_Scroll);
}