function show_dropdown(e) {
    e.className= "main-menu-item main-menu-item-active";
    var pos = get_position(e); 
    pos.top+=$(e).height()+6; 
    $(e).children(".main-menu-dropdown").css("display","block").css("left",pos.left+"px").css("top",pos.top+"px");; 
}

function hide_dropdown(e) {
    e.className= "main-menu-item";  
    $(e).children(".main-menu-dropdown").css("display","none");  
} 

this.get_position = function(e)
{
    var left = 0;
    var top = 0;
    while(e) {
        left += e.offsetLeft;
        top += e.offsetTop;
        e = e.offsetParent; }
    return { left:left,top:top }
}

window.onload = function() { 
$(".collapsible > li .collapsible-title").mousedown(function(){
    var e = $(this).next();
    if(e.height()) {
        e.css("overflow","hidden").animate({height:0});
        $(this).css("background","url(/rsu/res/collapsible-collapsed.gif) no-repeat");  
    } 
    else {
        e.animate({height:e.get(0).scrollHeight}); 
        $(this).css("background","url(/rsu/res/collapsible-expanded.gif) no-repeat"); 
    } 
  
})    
}