var version = false;


function browser () {
   this.name         = navigator.appName.toLowerCase ();
   this.majversion   = parseInt ( navigator.appVersion.toLowerCase () );
   this.minversion   =
      parseInt ( ( 
            parseFloat ( 
               navigator.appVersion.toLowerCase () 
            ) - this.majversion 
         )
         * 10
      );
   this.agent     = navigator.userAgent.toLowerCase ();

   this.dom       = ( document.getElementById );
   
   this.opera     = ( this.agent.indexOf ( 'opera' ) >= 0 );
   this.IE        = ( this.agent.indexOf ( 'msie' ) >= 0 && !this.opera );
   this.NS        = ( this.agent.indexOf ( 'netscape' ) >= 0 && !this.opera );
   this.NS4       = ( this.majversion >= 4 );
   this.NS6       = ( this.majversion >= 5 );
   this.IE4       = ( this.majversion >= 4 );
   this.IE5       = ( this.majversion >= 5 );
   this.IE55      = ( this.IE5 && this.minversion >= 5 );
   this.IE6       = ( this.majversion >= 6 );
}

var is = new browser ();
var version = ( is.NS4 || is.IE4 || is.opera );
var button = [];

if ( version ) {
   for ( var t = 1; t <= 12; t ++ ) {
      button [ t ] = new Image ();   
   }
   button [ 1 ].src="gfx/nav-home-nl-01.gif";
   button [ 2 ].src="gfx/nav-home-nl-02.gif";
   button [ 3 ].src="gfx/nav-bedrijf-nl-01.gif";
   button [ 4 ].src="gfx/nav-bedrijf-nl-02.gif";
   button [ 7 ].src="gfx/nav-activiteiten-nl-01.gif";
   button [ 8 ].src="gfx/nav-activiteiten-nl-02.gif";
   button [ 9 ].src="gfx/nav-contact-nl-01.gif";
   button [ 10 ].src="gfx/nav-contact-nl-02.gif";
   button [ 11 ].src="gfx/nav-vacatures-nl-01.gif";
   button [ 12 ].src="gfx/nav-vacatures-nl-02.gif";
   }

   
function display ( img, num ) { 
   if ( version ) 
      document.images [ img ].src = button [ num ].src;
}