function addLoadEvent(func) 
{
    var oldonload = window.onload;
    if (typeof window.onload != 'function') 
    {
        window.onload = func;
    } 
    else 
    {
        window.onload = function() 
        {
            oldonload();
            func();
        }
    }
}


function preloadimages()
{
    var args = preloadimages.arguments;
    document.imageArray = new Array(args.length);
    for (i=0;i<args.length;i++)
    {
        document.imageArray[i]= new Image;
        document.imageArray[i].src = args[i];
        
    }
}

function showPic(whichpic) 
{
    var source = whichpic.getAttribute("href");
    var text = whichpic.getAttribute("title");
    var placeholder = document.getElementById("placeholder");
    placeholder.setAttribute("src", source);
    var description = document.getElementById("balkcommentaar");
    description.firstChild.nodeValue = text;
}