if (document.images) {

marketingup       = new Image();
marketingup.src   = "http://www.bau-marketing.eu/images/menu/marketing-0.png" ;
marketingdown     = new Image() ;
marketingdown.src = "http://www.bau-marketing.eu/images/menu/marketing-1.png" ;

werbungup       = new Image();
werbungup.src   = "http://www.bau-marketing.eu/images/menu/werbung-0.png" ;
werbungdown     = new Image() ;
werbungdown.src = "http://www.bau-marketing.eu/images/menu/werbung-1.png" ;

pressearbeitup       = new Image();
pressearbeitup.src   = "http://www.bau-marketing.eu/images/menu/pressearbeit-0.png" ;
pressearbeitdown     = new Image() ;
pressearbeitdown.src = "http://www.bau-marketing.eu/images/menu/pressearbeit-1.png" ;

internetup       = new Image();
internetup.src   = "http://www.bau-marketing.eu/images/menu/internet-0.png" ;
internetdown     = new Image() ;
internetdown.src = "http://www.bau-marketing.eu/images/menu/internet-1.png" ;

referenzenup       = new Image();
referenzenup.src   = "http://www.bau-marketing.eu/images/menu/referenzen-0.png" ;
referenzendown     = new Image() ;
referenzendown.src = "http://www.bau-marketing.eu/images/menu/referenzen-1.png" ;

ueberunsup       = new Image();
ueberunsup.src   = "http://www.bau-marketing.eu/images/menu/ueberuns-0.png" ;
ueberunsdown     = new Image() ;
ueberunsdown.src = "http://www.bau-marketing.eu/images/menu/ueberuns-1.png" ;

blog_kalenderup       = new Image();
blog_kalenderup.src   = "http://www.bau-marketing.eu/images/menu/blog-kalender-0.png" ;
blog_kalenderdown     = new Image() ;
blog_kalenderdown.src = "http://www.bau-marketing.eu/images/menu/blog-kalender-1.png" ;

partnerup       = new Image();
partnerup.src   = "http://www.bau-marketing.eu/images/menu/partner-0.png" ;
partnerdown     = new Image() ;
partnerdown.src = "http://www.bau-marketing.eu/images/menu/partner-1.png" ;

kontaktup       = new Image();
kontaktup.src   = "http://www.bau-marketing.eu/images/menu/kontakt-0.png" ;
kontaktdown     = new Image() ;
kontaktdown.src = "http://www.bau-marketing.eu/images/menu/kontakt-1.png" ;

startseiteup       = new Image();
startseiteup.src   = "http://www.bau-marketing.eu/images/menu/startseite-0.png" ;
startseitedown     = new Image() ;
startseitedown.src = "http://www.bau-marketing.eu/images/menu/startseite-1.png" ;

servicecheckup       = new Image();
servicecheckup.src   = "http://www.bau-marketing.eu/images/menu/service_check-0.png" ;
servicecheckdown     = new Image() ;
servicecheckdown.src = "http://www.bau-marketing.eu/images/menu/service_check-1.png" ;

websitecheckup       = new Image();
websitecheckup.src   = "http://www.bau-marketing.eu/images/menu/website_check-0.png" ;
websitecheckdown     = new Image() ;
websitecheckdown.src = "http://www.bau-marketing.eu/images/menu/website_check-1.png" ;

pressecheckup       = new Image();
pressecheckup.src   = "http://www.bau-marketing.eu/images/menu/presse_check-0.png" ;
pressecheckdown     = new Image() ;
pressecheckdown.src = "http://www.bau-marketing.eu/images/menu/presse_check-1.png" ;

arbeitsbeispieleup       = new Image();
arbeitsbeispieleup.src   = "http://www.bau-marketing.eu/images/menu/arbeitsbeispiele-0.png" ;
arbeitsbeispieledown     = new Image() ;
arbeitsbeispieledown.src = "http://www.bau-marketing.eu/images/menu/arbeitsbeispiele-1.png" ;

jobsup       = new Image();
jobsup.src   = "http://www.bau-marketing.eu/images/menu/jobs-0.png" ;
jobsdown     = new Image() ;
jobsdown.src = "http://www.bau-marketing.eu/images/menu/jobs-1.png" ;

}
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" );
    }
}