function init_dw_Scroll() {
    var wndo = new dw_scrollObj('wn', 'lyr1');
    wndo.setUpScrollbar("dragBar", "track", "v", 1, 1);
    // id, autohide (hide when not needed), axis
    wndo.setUpScrollControls('scrollbar', true, 'v');
    
    // Demonstrating how you can include a jump to top link inside the scroll area 
    wndo.setUpScrollControls('wn');
    
}

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