/* rollover for home nav */

if (document.images) {
    homeup       = new Image();
    homeup.src   = "images/nav_home_d.gif" ;
    homedown     = new Image() ;
    homedown.src = "images/nav_home_r.gif" ;
    
    aboutup       = new Image();
    aboutup.src   = "images/nav_about_d.gif" ;
    aboutdown     = new Image() ;
    aboutdown.src = "images/nav_about_r.gif" ;
    
    galleryup       = new Image();
    galleryup.src   = "images/nav_gallery_d.gif" ;
    gallerydown     = new Image() ;
    gallerydown.src = "images/nav_gallery_r.gif" ;
    
    linksup       = new Image();
    linksup.src   = "images/nav_links_d.gif" ;
    linksdown     = new Image() ;
    linksdown.src = "images/nav_links_r.gif" ;
    
    contactup       = new Image();
    contactup.src   = "images/nav_contact_d.gif" ;
    contactdown     = new Image() ;
    contactdown.src = "images/nav_contact_r.gif" ;
}
function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
    }
}