function fotoopen(num,w,h){
if (screen.availWidth>w) left_window = (screen.availWidth-w)/2;
else left_window = 0
if (screen.availHeight>h) top_window = (screen.availHeight-h)/3;
else top_window = 0
h = h - 22;
window.open("../../design/img/fotos.asp?img="+num,"","left="+left_window+",top="+top_window+",width="+w+",height="+h+",menubar=1,resizable=1")
}