if (document.images) {

    drjohnbuttonup       = new Image();
    drjohnbuttonup.src   =   "/img/DentalGlasses.gif" ;
    drjohnbuttondown     = new Image() ;
    drjohnbuttondown.src = "/img/DentalGlassesBubble.gif" ;

    servicebuttonup       = new Image();
    servicebuttonup.src   =   "/img/services-buttons/blank_button.jpg" ;
    servicebuttondown     = new Image() ;
    servicebuttondown.src = "/img/services-buttons/braces_button_on.jpg" ;

    bracesbuttonup       = new Image();
    bracesbuttonup.src   =   "/img/services-buttons/blank_button.jpg" ;
    bracesbuttondown     = new Image() ;
    bracesbuttondown.src = "/img/services-buttons/braces_button_on.jpg" ;

    bridgesbuttonup       = new Image();
    bridgesbuttonup.src   =   "/img/services-buttons/bridges_button.jpg" ;
    bridgesbuttondown     = new Image() ;
    bridgesbuttondown.src = "/img/services-buttons/bridges_button_on.jpg" ;

    cleaningbuttonup       = new Image();
    cleaningbuttonup.src   =   "/img/services-buttons/cleaning_button.jpg" ;
    cleaningbuttondown     = new Image() ;
    cleaningbuttondown.src = "/img/services-buttons/cleaning_button_on.jpg" 

    crownsbuttonup       = new Image();
    crownsbuttonup.src   =   "/img/services-buttons/crowns_button.jpg" ;
    crownsbuttondown     = new Image() ;
    crownsbuttondown.src = "/img/services-buttons/crowns_button_on.jpg" 

    extractionsbuttonup       = new Image();
    extractionsbuttonup.src   =   "/img/services-buttons/extractions_button.jpg" ;
    extractionsbuttondown     = new Image() ;
    extractionsbuttondown.src = "/img/services-buttons/extractions_button_on.jpg"

    fillingsbuttonup       = new Image();
    fillingsbuttonup.src   =   "/img/services-buttons/fillings_button.jpg" ;
    fillingsbuttondown     = new Image() ;
    fillingsbuttondown.src = "/img/services-buttons/fillings_button_on.jpg" 

    implantsbuttonup       = new Image();
    implantsbuttonup.src   =   "/img/services-buttons/implants_button.jpg" ;
    implantsbuttondown     = new Image() ;
    implantsbuttondown.src = "/img/services-buttons/implants_button_on.jpg"

    rootcanalbuttonup       = new Image();
    rootcanalbuttonup.src   =   "/img/services-buttons/rootcanals_button.jpg" ;
    rootcanalbuttondown     = new Image() ;
    rootcanalbuttondown.src = "/img/services-buttons/rootcanals_button_on.jpg" 

    veneerbuttonup       = new Image();
    veneerbuttonup.src   =   "/img/services-buttons/veneers_button.jpg" ;
    veneerbuttondown     = new Image() ;
    veneerbuttondown.src = "/img/services-buttons/veneers_button_on.jpg" 

    whiteningbuttonup       = new Image();
    whiteningbuttonup.src   =   "/img/services-buttons/whitening_button.jpg" ;
    whiteningbuttondown     = new Image() ;
    whiteningbuttondown.src = "/img/services-buttons/whitening_button_on.jpg" 

    xraybuttonup       = new Image();
    xraybuttonup.src   =   "/img/services-buttons/xrays_button.jpg" ;
    xraybuttondown     = new Image() ;
    xraybuttondown.src = "/img/services-buttons/xrays_button_on.jpg" 

    botoxbuttonup       = new Image();
    botoxbuttonup.src   =   "/img/services-buttons/botox_button.jpg" ;
    botoxbuttondown     = new Image() ;
    botoxbuttondown.src = "/img/services-buttons/botox_button_on.jpg" 

    juvedermbuttonup       = new Image();
    juvedermbuttonup.src   =   "/img/services-buttons/juvederm_button.jpg" ;
    juvedermbuttondown     = new Image() ;
    juvedermbuttondown.src = "/img/services-buttons/juvederm_button_on.jpg" 

    specialtybuttonup       = new Image();
    specialtybuttonup.src   =   "/img/services-buttons/specialty_button.gif" ;
    specialtybuttondown     = new Image() ;
    specialtybuttondown.src = "/img/services-buttons/specialty_button_on.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" );
    }
}