function encode(strURL) {
     strURL = escape(strURL);
     strURL = strURL.replace(/\//g,"%2F");
     strURL = strURL.replace(/\?/g,"%3F");
     strURL = strURL.replace(/=/g,"%3D");
     strURL = strURL.replace(/&/g,"%26");
     strURL = strURL.replace(/@/g,"%40");
     return strURL;
} 

function doTrack(trackPage) {
	referrer = document.referrer;
	landing  = document.location;
	width    = screen.width;
	height   = screen.height;
	theImage = new Image();
	theImage.src = trackPage + "?referrer=" + encode(referrer) + "&screenwidth=" + width + "&screenheight=" + height + "&landing=" + encode(landing);
}