function foto(foto){
	var w=320;
	var h=240;
	var settings='location=no,directories=no,menubar=no,toolbar=no,status=no,scrollbars=no,resizable=no,fullscreen=no';
	openPopup(escape(foto),'foto',w,h,settings);
}
/* popup */
function openPopup(urlpopup,nomepopup,w,h,settingspopup){
	var x=(screen.width-w)/2;
	var y=(screen.height-h)/2-20;
	if(x<0)x=0;
	if(y<0)y=0;
	if(w>screen.width)w=screen.width;
	if(h>screen.height)h=screen.height;
	var settings='top='+y+',left='+x+',width='+w+',height='+h+','+settingspopup;
	var popup=window.open("popup.htm?"+urlpopup,nomepopup,settings);
	popup.focus();
}