window.onload = displayPics;

function displayPics()
{
	var photos = document.getElementById('gallery');
	var liens = photos.getElementsByTagName('a');
	var zoom = document.getElementById('zoom');
	
	for (var i = 0 ; i < liens.length ; ++i) { 
		liens[i].onclick = function() {
			zoom.src = this.href;
			return false;
		};
	}
}