if(document.images){
	basedir="/images/"
	// create a new image in memory and reference it to the actual images
 	propertyon 		= 	new Image(); propertyon.src = basedir + "leftnav_property_on.gif";
  	propertyoff 	= 	new Image(); propertyoff.src = basedir + "leftnav_property_off.gif";
	tradingon			=	new Image(); tradingon.src = basedir + "leftnav_trading_on.gif";
	tradingoff			=	new Image(); tradingoff.src = basedir + "leftnav_trading_off.gif";
	enterprizeon 		= 	new Image(); enterprizeon.src = basedir + "leftnav_enterprize_on.gif";
  	enterprizeoff 	= 	new Image(); enterprizeoff.src = basedir + "leftnav_enterprize_off.gif";
	filmson 		= 	new Image(); filmson.src = basedir + "leftnav_film_on.gif";
  	filmsoff 	= 	new Image(); filmsoff.src = basedir + "leftnav_film_off.gif";
	windfarmson 		= 	new Image(); windfarmson.src = basedir + "leftnav_windfarm_on.gif";
  	windfarmsoff 	= 	new Image(); windfarmsoff.src = basedir + "leftnav_windfarm_off.gif";
	bpraon 		= 	new Image(); bpraon.src = basedir + "leftnav_bpra_on.gif";
  	bpraoff 	= 	new Image(); bpraoff.src = basedir + "leftnav_bpra_off.gif";
	
  }