if (document.images) {
   about_on = new Image
   about_off = new Image
    
   about_on.src = "images/about_on.gif"
   about_off.src = "images/about_off.gif"

   contact_on = new Image
   contact_off = new Image
    
   contact_on.src = "images/contact_on.gif"
   contact_off.src = "images/contact_off.gif"

   bookmark_on = new Image
   bookmark_off = new Image
    
   bookmark_on.src = "images/bookmark_on.gif"
   bookmark_off.src = "images/bookmark_off.gif"

   viewmap_on = new Image
   viewmap_off = new Image
    
   viewmap_on.src = "images/viewmap_on.gif"
   viewmap_off.src = "images/viewmap_off.gif"
   
   news_on = new Image
   news_off = new Image
    
   news_on.src = "images/news_on.gif"
   news_off.src = "images/news_off.gif"
  
  
   	
}
else {
	 
	about_on = ""
   	about_off = ""	
	document.about = ""

	 contact_on = ""
   	 contact_off = ""
	document.contact = ""
	
	bookmark_on = ""
   	 bookmark_off = ""
	document.bookmark = ""

	viewmap_on = ""
   	viewmap_off = ""
	document.viewmap = ""
	
	news_on = ""
   	news_off = ""
	document.news = ""
	 
		 
	 
	 }