function dialog(s,img,w,h) {
  if (!w) w = 450; if (!h) h = 300;
  $("body").prepend('<div id="dialog" style="position:absolute;width:100%;"><div style="width:100%;height:100%;background-color:#000;"></div><div style="position:absolute;padding:10px;border:3px solid #008000;background-color:#fff;width:'+w+'px;overflow:auto;">&nbsp;</div></div>')
  .children(':first').css({"zIndex":999999,"height":Math.max($(window).height(),$(document).height())})
  .children(':first').css({'opacity':0.2}).bind("click", function() { $("#dialog").empty().remove(); })
  .next().css({left:Math.round(($(window).width()-w)/2)+$(window).scrollLeft(),top:Math.round(($(window).height()-h)/2)+$(window).scrollTop()}).bind("click", function() { $("#dialog").empty().remove(); })
  .html('<img src="img/profile/'+img+'" align="right" width="200" height="200" border="0">'+s);
}