if(document.images){
	 
	 sub_map1=new Image
	 sub_map2=new Image
	 sub_map3=new Image
	 sub_map4=new Image
	 sub_map5=new Image
	 sub_map6=new Image
	 sub_map7=new Image
	 sub_map8=new Image
	 sub_map9=new Image
	 sub_map10=new Image
	 
	 
	 
	 sub_map1.src="http://www.teachu2.co.uk/images/menu/home-on.jpg"
	 sub_map2.src="http://www.teachu2.co.uk/images/menu/home.jpg"
	 sub_map3.src="http://www.teachu2.co.uk/images/menu/video1-on.jpg"
	 sub_map4.src="http://www.teachu2.co.uk/images/menu/video1.jpg"
	 sub_map5.src="http://www.teachu2.co.uk/images/menu/video2-on.jpg"
	 sub_map6.src="http://www.teachu2.co.uk/images/menu/video2.jpg"
	 sub_map7.src="http://www.teachu2.co.uk/images/menu/video3-on.jpg"
	 sub_map8.src="http://www.teachu2.co.uk/images/menu/video3.jpg"
	 sub_map9.src="http://www.teachu2.co.uk/images/menu/bookings-on.jpg"
	 sub_map10.src="http://www.teachu2.co.uk/images/menu/bookings.jpg"
	 
	 	 
	 }
	 else{
	 sub_map1=""
	 sub_map2=""
	 sub_map3=""
	 sub_map4=""
	 sub_map5=""
	 sub_map6=""
	 sub_map7=""
	 sub_map8=""
	 sub_map9=""
	 sub_map10=""
		
	 	 
	 document.home=""
	 document.video1=""
	 document.video2=""
	 document.video3=""
	 document.bookings=""
	 
	 }