function displayInformation(){
    opacityTween = new OpacityTween(document.getElementById('information'),Tween.regularEaseIn, 0, 100,2);
    opacityTween.start();
}

function popup(url)
 {
   /*mywindow = window.open(url,"blank","location=0,status=0,menubar=0,toolbar=0,scrollbars=0, width=500,height=500");
   mywindow.moveTo(300,130);*/
    var width  = 550;
    var height = 500;
    var left   = (screen.width  - width)/2;
    var top    = (screen.height - height)/2;
    var params = 'width='+width+', height='+height;
    params += ', top='+top+', left='+left;
    params += ', directories=no';
    params += ', location=no';
    params += ', menubar=no';
    params += ', resizable=no';
    params += ', scrollbars=no';
    params += ', status=no';
    params += ', toolbar=no';
    newwin=window.open(url,'windowname5', params);
    if (window.focus) {newwin.focus()}
    return false;

 }