Function Not being called

gateway.as

gatewayListener.onLoadStart = function(target_mc) {
		//target_mc.stop();
		_root.gatewayClip = target_mc;
		if(target_mc == _level0.vidWindowClip.vidImgLoader && _root.gatewayPlaying == 1) {
		_root.vidWindowClip.createEmptyMovieClip("gatewayTimer",_root.vidWindowClip.getNextHighestDepth());
			_root.vidWindowClip.gatewayTimer.onEnterFrame = function(){
					getURL("javascript:writeOutput('300x250 Total Frames: "+target_mc._totalframes+"')");
					if(target_mc._currentframe == target_mc._totalframes) {
						getURL("javascript:writeOutput('gateway ended')");
						trace("gateway ended");
						_root.gatewayPlaying = 0;
						_root.gatewayComplete = 1;
						target_mc.stop();
						mcLoader.loadClip(_root.ad300x250URL,_root.vidWindowClip.vidImgLoader);
						doConnect();
						delete this.onEnterFrame;
						delete _root.albumTile.onRelease;
						mcLoader.removeListener(gatewayListener);
					}
				}
			
			}
		} 
	}else {
		doConnect();
	}