if(document.images){
	 
	 sub_nav1=new Image
	 sub_nav2=new Image
	 sub_nav3=new Image
	 sub_nav4=new Image
	 sub_nav5=new Image
	 sub_nav6=new Image
	 sub_nav7=new Image
	 sub_nav8=new Image
	 sub_nav9=new Image
	 sub_nav10=new Image
	 sub_nav11=new Image
	 sub_nav12=new Image
	 sub_nav13=new Image
	 sub_nav14=new Image
	 sub_nav15=new Image
	 sub_nav16=new Image
		 
	 sub_nav1.src="http://www.preretail.co.uk/images/menu/home-on.jpg"
	 sub_nav2.src="http://www.preretail.co.uk/images/menu/home-off.jpg"
	 sub_nav3.src="http://www.preretail.co.uk/images/menu/fulfilment-on.jpg"
	 sub_nav4.src="http://www.preretail.co.uk/images/menu/fulfilment-off.jpg"
	 sub_nav5.src="http://www.preretail.co.uk/images/menu/archiving-on.jpg"
	 sub_nav6.src="http://www.preretail.co.uk/images/menu/archiving-off.jpg"
	 sub_nav7.src="http://www.preretail.co.uk/images/menu/store-on.jpg"
	 sub_nav8.src="http://www.preretail.co.uk/images/menu/store-off.jpg"
	 sub_nav9.src="http://www.preretail.co.uk/images/menu/contact-on.jpg"
	 sub_nav10.src="http://www.preretail.co.uk/images/menu/contact-off.jpg"
	 sub_nav11.src="http://www.preretail.co.uk/images/menu/wanted-on.jpg"
	 sub_nav12.src="http://www.preretail.co.uk/images/menu/wanted-off.jpg"
	 sub_nav13.src="http://www.preretail.co.uk/images/menu/hire-on.jpg"
	 sub_nav14.src="http://www.preretail.co.uk/images/menu/hire-off.jpg"
	 sub_nav15.src="http://www.preretail.co.uk/images/menu/trading-on.jpg"
	 sub_nav16.src="http://www.preretail.co.uk/images/menu/trading-off.jpg"
	 

	 }
	 else{
	 sub_nav1=""
	 sub_nav2=""
	 sub_nav3=""
	 sub_nav4=""
	 sub_nav5=""
	 sub_nav6=""
	 sub_nav7=""
	 sub_nav8=""
	 sub_nav9=""
	 sub_nav10=""
	 sub_nav11=""
	 sub_nav12=""
	 sub_nav13=""
	 sub_nav14=""
	 sub_nav15=""
	 sub_nav16=""
	 
	 	 
	 document.home=""
	 document.fulfilment=""
	 document.archive=""
	 document.store=""
	 document.contact=""
	 document.wanted=""
	 document.hire=""
	 document.trading=""
	 	 
	 }