function startList() {
			if (document.all&&document.getElementById) {
				navRoot = document.getElementById("nav");
				for (i=0; i<navRoot.childNodes.length; i++) {
					node = navRoot.childNodes[i];
					if (node.nodeName=="LI") {
						node.onmouseover=function() {
							this.className+=" over";
						}
						node.onmouseout=function() {
							this.className=this.className.replace(" over", "");
						}
					}
				}
			}
		}
		
		window.onload=startList;

		function photo(id, sirka, vyska)
                 {              
		    vyska= vyska + 20;

		    availHeight = screen.height;
		    availWidth = screen.width;
		
		    if (availHeight < 342) {posTop = 0;}
		    else {posTop = (availHeight - vyska)/2;}

		    if (availWidth < 320) {posLeft = 0;}
		    else {posLeft = (availWidth - sirka)/2;}

		    atts = "width=" + sirka +",height=" + vyska + ",directories=0,location=0,menubar=0,resizable=0,scrollbars=0,status=0,toolbar=0,top=" + posTop + ",left=" + posLeft;        

		  var pikcr="imgopener.php?id="+id;
                  window.open(pikcr, 'pikcrzobrazovac', atts);
                 }