if (document.images) {
    homebuttonup       = new Image();
    homebuttonup.src   = "images/ez_vnavbar_b1.gif" ;
    homebuttondown     = new Image() ;
    homebuttondown.src = "images/ez_vnavbar_b1_over.gif" ;

    videobuttonup       = new Image();
    videobuttonup.src   = "images/ez_vnavbar_b2.gif" ;
    videobuttondown     = new Image() ;
    videobuttondown.src = "images/ez_vnavbar_b2_over.gif" ;

    tradebuttonup       = new Image();
    tradebuttonup.src   = "images/ez_vnavbar_b3.gif" ;
    tradebuttondown     = new Image() ;
    tradebuttondown.src = "images/ez_vnavbar_b3_over.gif" ;

    linkbuttonup       = new Image();
    linkbuttonup.src   = "images/ez_vnavbar_b4.gif" ;
    linkbuttondown     = new Image() ;
    linkbuttondown.src = "images/ez_vnavbar_b4_over.gif" ;

    contactbuttonup       = new Image();
    contactbuttonup.src   = "images/ez_vnavbar_b5.gif" ;
    contactbuttondown     = new Image() ;
    contactbuttondown.src = "images/ez_vnavbar_b5_over.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" );
    }
}