function initPage(){
    
    var catImgLinks = $$("#categoryLinkContainer img");                        
    for(var i=0; i<catImgLinks.length; i++){
        Event.observe(catImgLinks[i], 'mouseover', onCategoryMouseOver, false);
        Event.observe(catImgLinks[i], 'mouseout', onCategoryMouseOut, false);
    }
    /*
    var eventLinks = $$("#calendarEventsContainer li a");
    for(var i=0; i<eventLinks.length; i++){
        Event.observe(eventLinks[i], 'mouseover', onShowEventTooltip, false);
        Event.observe(eventLinks[i], 'mouseout', onHideEventTooltip, false);
    }
    */
    
}
/*
function onShowEventTooltip(evt){
    var id = Event.element(evt).id;
    $("tooltip_"+id).style.display = "block";
}

function onHideEventTooltip(evt){
    var id = Event.element(evt).id;
    $("tooltip_"+id).style.display = "none";
}
*/

function onCategoryMouseOver(evt){
    var img = Event.element(evt);
    img.src = img.src.replace("_off","_on");              
}

function onCategoryMouseOut(evt){
    var img = Event.element(evt);
    img.src = img.src.replace("_on","_off");   
}

Event.observe(window, 'load', initPage, false);