var home = new Image();
home.src="img/nav/home_a.gif";

var homeoff = new Image();
homeoff.src="img/nav/home.gif";

var contact_us = new Image();
contact_us.src="img/nav/contact_us_a.gif";

var contact_usoff = new Image();
contact_usoff.src="img/nav/contact_us.gif";

var what = new Image();
what.src="img/nav/what_a.gif";

var whatoff = new Image();
whatoff.src="img/nav/what.gif";

var projects = new Image();
projects.src="img/nav/projects_a.gif";

var projectsoff = new Image();
projectsoff.src="img/nav/projects.gif";

var videos = new Image();
videos.src="img/nav/videos_a.gif";

var videosoff = new Image();
videosoff.src="img/nav/videos.gif";

var links = new Image();
links.src="img/nav/links_a.gif";

var linksoff = new Image();
linksoff.src="img/nav/links.gif";

var forum = new Image();
forum.src="img/nav/forum_a.gif";

var forumoff = new Image();
forumoff.src="img/nav/forum.gif";


function on(imgname, action)
{
if(action)
  {
   eval ('document.'+imgname+'.src = '+imgname+'.src')
   }
else eval ('document.'+imgname+'.src = '+imgname+'off.src');
}