// preload images
  if (document.images)
   {
	 home_on= new Image();
     home_on.src="media/common/home_hover.gif";     
     home_off= new Image();
     home_off.src="media/common/home.gif";     

	 tenants_on= new Image();
     tenants_on.src="media/common/tenants_hover.gif";     
     tenants_off= new Image();
     tenants_off.src="media/common/tenants.gif";     

     register_on= new Image();
     register_on.src="media/common/register_hover.gif";     
     register_off= new Image();
     register_off.src="media/common/register.gif";     
   }