/* set layer visibility */
function setZIndex(id, z_index) {
	document.getElementById(id).style.zIndex = z_index;
}
// Define Script.aculo.us draggable elements
var elements = [
'box1',
'box2',
'box3',
'box4',
'box5',
'box6',
'box7'
];
// Make ^them draggable
window.onload = function() {
   elements.each(
       function(item) {
           new Draggable(item, {});
       }
   );
}