function newImage( imgSrc ){

 var imgName = new Image();
 imgName.src = imgSrc;

 return imgName;

}

function change( imgName, imgLocation )
{
 document[imgName].src = imgLocation ;
}

var preloadFlag = false;
function loadImages()
{
 if (document.images)
 {
 home = newImage("images/nav/nav_home_on.gif");
 register = newImage("images/nav/nav_register_on.gif");
 search = newImage("images/nav/nav_search_on.gif");
 owners = newImage("images/nav/nav_owners_on.gif");
 scouts = newImage("images/nav/nav_scouts_on.gif");
 contact = newImage("images/nav/nav_contact_on.gif");
 logout = newImage("images/nav/nav_logout_on.gif");
 login = newImage("images/nav/nav_login_on.gif");

 preloadFlag = true;
 }
}