function showImage(what,w,h,root,title) {
	var scroll=0;
	if (w>screen.width) {
		w=screen.width;
		scroll=1;
	}
	if (h>screen.height) {
		h=screen.height;
		scroll=1;
	}

	var left = (screen.width/2) - w/2;
  	var top = (screen.height/2) - h/2;

	var opt='toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars='+scroll+',height='+h+',width='+w+',top='+top+',left='+left;
	
	var titleAdd = '';
	if (title) {
		titleAdd = '&title='+escape(title);
	}
	
	var wnd= window.open(root+'showimage.php?name='+what+titleAdd,'',opt);
	wnd.focus();
}