var bookmarkurl="http://localhost/chat";
  var bookmarktitle="Xchat";
  
  function addbookmark()
  {
    window.external.AddFavorite(bookmarkurl,bookmarktitle);
  }
  
  function openNewWindow(URLtoOpen, windowName, windowFeatures) 
  { 
    newWindow=window.open(URLtoOpen, windowName, windowFeatures);
  }
  
  function maxWindow(url, name, width, height) 
  {
    features = 'scrollbars=1,resizable=1,menubar=0,toolbar=0,location=0,status=0,top=0,left=0,screenX=0,screenY=0,';
    if (window.screen) {
      aw = screen.availWidth;
      ah = screen.availHeight;
      features = features+'width='+(aw-20)+',height='+(ah-38);
    }
    else {
      features = features+'width='+width+',height='+height;
    }
    window.open(url, name, features);
  }

  function popupWindow(url, w, h) 
  {
    var middleLeft = 400 - w;
    var middleTop = 10;
	        
    if (window.screen) {
      middleLeft = (screen.availWidth / 2) - (w / 2);
    }
			          
     window.open(url, '', 'scrollbars=0,resizable=0,menubar=0,toolbar=0,location=0,status=0,top='+middleTop+',left='+middleLeft+',width='+w+',height='+h);
  }