function setMarkerIconKey($iconImage,$iconShadow='',$iconAnchorX = 'x',$iconAnchorY = 'x',$infoWindowAnchorX = 'x',$infoWindowAnchorY = 'x'){
    	$_iconKey = $this->getIconKey($iconImage,$iconShadow);
    	if(isset($this->_marker_icons[$_iconKey])){
    		return $_iconKey;
    	}else{
    		return $this->addIcon($iconImage,$iconShadow,$iconAnchorX,$iconAnchorY,$infoWindowAnchorX,$infoWindowAnchorY);
    	}
    }