if (document.images) {
    twitterup       = new Image();
    twitterup.src   = "buttons/twitter_small.png" ;
    twitterdown     = new Image() ;
    twitterdown.src = "buttons/twitter.png" ;
    descriptiontwitterdown  = new Image() ;
    descriptiontwitterdown.src = "description/twitter.png";
    
    resultsup       = new Image();
    resultsup.src   = "buttons/results_small.png" ;
    resultsdown     = new Image() ;
    resultsdown.src = "buttons/results.png" ;
    descriptionresultsdown  = new Image() ;
    descriptionresultsdown.src = "description/results.png";

    programup       = new Image();
    programup.src   = "buttons/program_small.png" ;
    programdown     = new Image() ;
    programdown.src = "buttons/program.png" ;
    descriptionprogramdown  = new Image() ;
    descriptionprogramdown.src = "description/program.png";
    
    galleryup       = new Image();
    galleryup.src   = "buttons/gallery_small.png" ;
    gallerydown     = new Image() ;
    gallerydown.src = "buttons/gallery.png" ;
    descriptiongallerydown  = new Image() ;
    descriptiongallerydown.src = "description/gallery.png";
    
    videoup       = new Image();
    videoup.src   = "buttons/video_small.png" ;
    videodown     = new Image() ;
    videodown.src = "buttons/video.png" ;
    descriptionvideodown  = new Image() ;
    descriptionvideodown.src = "description/video.png";
    
    cvup       = new Image();
    cvup.src   = "buttons/cv_small.png" ;
    cvdown     = new Image() ;
    cvdown.src = "buttons/cv.png" ;
    descriptioncvdown  = new Image() ;
    descriptioncvdown.src = "description/cv.png";

    sponsorsup       = new Image();
    sponsorsup.src   = "buttons/sponsors_small.png" ;
    sponsorsdown     = new Image() ;
    sponsorsdown.src = "buttons/sponsors.png" ;
    descriptionsponsorsdown  = new Image() ;
    descriptionsponsorsdown.src = "description/sponsors.png";
    
    contactup       = new Image();
    contactup.src   = "buttons/contact_small.png" ;
    contactdown     = new Image() ;
    contactdown.src = "buttons/contact.png" ; 
    descriptioncontactdown  = new Image() ;
    descriptioncontactdown.src = "description/contact.png";

    
    descriptionup     = new Image();
    descriptionup.src   = "description/blank.gif" ;
}
function buttondown( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "down.src" );
    }
    
    if (buttonname == "twitter"){
    document[ "description" ].src = eval( "descriptiontwitterdown.src" );  
    }
    else if (buttonname == "results"){
    document[ "description" ].src = eval( "descriptionresultsdown.src" );  
    }
    else if (buttonname == "program"){
    document[ "description" ].src = eval( "descriptionprogramdown.src" );  
    }
    else if (buttonname == "gallery"){
    document[ "description" ].src = eval( "descriptiongallerydown.src" );  
    }
    else if (buttonname == "video"){
    document[ "description" ].src = eval( "descriptionvideodown.src" );  
    }
    else if (buttonname == "cv"){
    document[ "description" ].src = eval( "descriptioncvdown.src" );  
    }
    else if (buttonname == "sponsors"){
    document[ "description" ].src = eval( "descriptionsponsorsdown.src" );  
    }
    else if (buttonname == "contact"){
    document[ "description" ].src = eval( "descriptioncontactdown.src" );  
    }
    
}
function buttonup ( buttonname )
{
    if (document.images) {
      document[ buttonname ].src = eval( buttonname + "up.src" );
      document[ "description" ].src = eval( "descriptionup.src" );
    }
}