function prepareGallery(){
    if( document.getElementById && document.getElementsByTagName ){
        if( document.getElementById( 'imagegallery' ) ){
            var gallery = document.getElementById( 'imagegallery' );
            var links = gallery.getElementsByTagName( 'a' );
            for( var i=0; i < links.length; i++ ){
                links[i].onclick = function(){
                    return showPic(this);
                }
            }
        }
    }
}
function showPic (whichpic) {
    if (document.getElementById) {
        document.getElementById('placeholder').src = whichpic.href;
        if (whichpic.title) {
            document.getElementById('desc').childNodes[0].nodeValue = whichpic.title;
        }
        else {
            document.getElementById('desc').childNodes[0].nodeValue = whichpic.childNodes[0].nodeValue;
        }
        return false;
    }
    else {
        return true;
    }
}
window.onload = prepareGallery;