var cats = new Array();

cats[0] = new Array("shop", '0 0');
cats[1] = new Array("gallery", '-215px 0');
cats[2] = new Array("workshops", '-645px 0');
cats[3] = new Array("about", '-860px 0');
cats[4] = new Array("contact", '-429px 0');

function homeRolls() {
	if (!document.getElementById) return false;
	if (!document.getElementsByTagName) return false;
	
	var links = document.getElementsByTagName("a");
	for (var i=0; i < links.length; i++) {
    	if (links[i].className.match("navroll")) {
			links[i].onmouseover = function() {
				var cat = this.id.substring(3,this.id.length);
				
				for(i=0; i<cats.length; i++) {
					if (cats[i][0] == cat) {
						val = cats[i][1];
						break;
					}
				}

				document.getElementById('photo_box').style.backgroundPosition=val;
				document.getElementById('description_box_'+cat).style.marginLeft='0';
		
				return false;
			}
			
			links[i].onmouseout = function() {
				var cat = this.id.substring(3,this.id.length);
				
				document.getElementById('photo_box').style.backgroundPosition='-1075px 0';
				document.getElementById('description_box_'+cat).style.marginLeft='-999em';
			}
		}
	}
}

Event.observe(window, 'load', homeRolls, false);