function show_img(url, width, height, title, message, winpars)
{
var wL = (screen.width - width) / 2;
var wT = (screen.height - height) / 2;
var wp;
wp = "width=" + width + ",height=" + height + ",left=" + wL + ",top=" + wT + (typeof(winpars) == "undefined" ? "" : winpars);
var okno = window.open("", "", wp);
okno.document.open();
okno.document.write('' + (typeof(title) == "undefined" ? "" : title) +
'');
okno.document.close();
return typeof(okno) == "object" ? true : false;
}