function getAddOverlayJS(){
		 $_output = "";
		 foreach($this->_overlays as $_key=>$_overlay){
			 $_output .= "
			 	 var bounds = new google.maps.LatLngBounds(new google.maps.LatLng(".$_overlay["bounds"]["ne"]["lat"].", ".$_overlay["bounds"]["ne"]["long"]."), new google.maps.LatLng(".$_overlay["bounds"]["sw"]["lat"].", ".$_overlay["bounds"]["sw"]["long"]."));
				 var image = '".$_overlay["img"]."';
			     overlays".$this->map_id."[$_key] = new CustomOverlay(bounds, image, map".$this->map_id.", ".$_overlay["opacity"].");
			 ";
		 }
		 return $_output;
	 }