function displayPics() 
{ 
    var photos = document.getElementById('top-photo') ; 
    var liens = photos.getElementsByTagName('a') ; 
    var big_photo = document.getElementById('big_pict') ; 
 
    var titre_photo = document.getElementById('photo').getElementsByTagName('dt')[0] ; 

    for (var i = 0 ; i < liens.length ; ++i) { 

        liens[i].onclick = function() { 
            big_photo.src = this.href;
            big_photo.alt = this.title;
            titre_photo.firstChild.nodeValue = this.title;
            return false; 
        }; 
    } 
} 
window.onload = displayPics;