function foo(){
	...
	GDownloadUrl(entitiesUrl, function(data, responseCode)
	{
		if((200==responseCode)&&(0!=data.length))
		{
			try{
				var iStart = 0;
				var arePoints = false;
				var polylineLevels = "";
				//File structure is [encoded Levels<br>encoded Polylines<br>...]
				do
				{
					var iEnd = data.indexOf("<br>",iStart);
					if( false == arePoints)
					{//Levels
						polylineLevels = data.substring(iStart,iEnd);
						arePoints = true;
					}
					else
					{//Points
						var polygon = new  GPolygon.fromEncoded({
						 polylines: [{color: "#ffff00", weight: 2, opacity:1.0,
						 points: data.substring(iStart,iEnd),
						 levels: polylineLevels,
						 zoomFactor: 2, numLevels: 18}], 
						fill: true, color:" #ffff00", opacity: 0.3, outline: true});
						googleMap.addOverlay(polygon);
						arePoints = false;
					}
					iStart = iEnd + 4;//jump above '<br>' to the next polylines
				}while( data.length > iStart)
			}catch(e){
				//here code to deal with errors;
			}
		}
		else
		{
			//here code to deal with errors;
		}
	});
	...
};//end foo()