if (document.images) {
    homebuttonup       = new Image();
    homebuttonup.src   = "images/mainav/homeoff.gif" ;
    homebuttondown     = new Image() ;
    homebuttondown.src = "images/mainav/homeon.gif" ;

    readybuttonup       = new Image();
    readybuttonup.src   = "images/mainav/readyoff.gif" ;
    readybuttondown     = new Image() ;
    readybuttondown.src = "images/mainav/readyon.gif" ;

    worksbuttonup       = new Image();
    worksbuttonup.src   = "images/mainav/worksoff.gif" ;
    worksbuttondown     = new Image() ;
    worksbuttondown.src = "images/mainav/workson.gif" ;

    powderbuttonup       = new Image();
    powderbuttonup.src   = "images/mainav/powderoff.gif" ;
    powderbuttondown     = new Image() ;
    powderbuttondown.src = "images/mainav/powderon.gif" ;

    faqbuttonup       = new Image();
    faqbuttonup.src   = "images/mainav/faqoff.gif" ;
    faqbuttondown     = new Image() ;
    faqbuttondown.src = "images/mainav/faqon.gif" ;

    contactbuttonup       = new Image();
    contactbuttonup.src   = "images/mainav/contactoff.gif" ;
    contactbuttondown     = new Image() ;
    contactbuttondown.src = "images/mainav/contacton.gif" ;

    pv1buttonup       = new Image();
    pv1buttonup.src   = "images/moviepreview/preview_001off.gif" ;
    pv1buttondown     = new Image() ;
    pv1buttondown.src = "images/moviepreview/preview_001on.gif" ;

    pv2buttonup       = new Image();
    pv2buttonup.src   = "images/moviepreview/preview_002off.gif" ;
    pv2buttondown     = new Image() ;
    pv2buttondown.src = "images/moviepreview/preview_002on.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" );
    }
}