function open_wnd(url, width, height){

	wx = (screen.availWidth - width)/2;
	wy = (screen.availHeight - height)/2;

	scrollbars = 0;
	if (width + 50 > screen.availWidth || height + 50 > screen.availHeight) scrollbars = 1;
	wnd=window.open(url, "_blank", "width="+width+",height="+height+",status=no,resizable=0,scrollbars="+scrollbars+",toolbar=no,menubar=no,left="+wx+",top="+wy);
}

function open_foto(url, width, height){

	wx = (screen.availWidth - width)/2;
	wy = (screen.availHeight - height)/2;

	scrollbars = 1;

	if (width + 50 > screen.availWidth || height + 50 > screen.availHeight) scrollbars = 1;
	window.open(url, "_blank", "width="+width+",height="+height+",status=no,resizable=0,scrollbars="+scrollbars+",toolbar=no,menubar=no,left="+wx+",top="+wy);
}