<!-- 
    if (document.images) {     
    
        empresaup              = new Image();
        empresaup.src          = "../../../interface/pub/img/website/empresa_off.gif" ;
        empresadown            = new Image() ;
        empresadown.src        = "../../../interface/pub/img/website/empresa_on.gif" ;                                                   
    
        areasnegociosup        = new Image();
        areasnegociosup.src    = "../../../interface/pub/img/website/areas_negocios_off.gif" ;
        areasnegociosdown      = new Image() ;
        areasnegociosdown.src  = "../../../interface/pub/img/website/areas_negocios_on.gif" ;  
        
        representacoesup       = new Image();
        representacoesup.src   = "../../../interface/pub/img/website/representacoes_off.gif" ;
        representacoesdown     = new Image() ;
        representacoesdown.src = "../../../interface/pub/img/website/representacoes_on.gif" ; 
    
        contactosup            = new Image();
        contactosup.src        = "../../../interface/pub/img/website/contactos_off.gif" ;
        contactosdown          = new Image() ;
        contactosdown.src      = "../../../interface/pub/img/website/contactos_on.gif" ;
        
        formularioup           = new Image();
        formularioup.src       = "../../../interface/pub/img/website/formulario_off.gif" ;
        formulariodown         = new Image() ;
        formulariodown.src     = "../../../interface/pub/img/website/formulario_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" );
        }
    }
// -->