var d = document;
var x;
var y;
var id;
var request;
var url = '/servlet/Picture?type=gallery&id=';
function parseMessages() {
    var r  = request.responseXML;
    d.getElementById('desc').innerHTML = r.getElementsByTagName('description')[0].firstChild.data;
    setTipPosition();
}
function setTipPosition() {
    var t = d.getElementById('tip').style;
    t.left = x-305 + 'px';
    t.top = y+5 + 'px';
    t.visibility = 'visible';
}