if (document.images)

   {

     pic1on= new Image(18,150);

     pic1on.src="images/overknop-bedrijfsprofiel.gif";  

     pic2on= new Image(150,18);

     pic2on.src="images/overknop-landmeten.gif"; 

     pic3on= new Image(150,18);

     pic3on.src="images/overknop-maatvoeren.gif"; 

     pic4on= new Image(150,18);

     pic4on.src="images/overknop-gps.gif"; 

     pic5on= new Image(150,18);

     pic5on.src="images/overknop-deformatiemeten.gif"; 

     pic6on= new Image(150,18);

     pic6on.src="images/overknop-uitzetten-gww.gif";

     pic7on= new Image(150,18);

     pic7on.src="images/overknop-volumebepaling.gif"; 

	 pic8on= new Image(150,18);

     pic8on.src="images/overknop-kadaster-informatie.gif"; 

     pic9on= new Image(150,18);

     pic9on.src="images/overknop-inpandige-metingen.gif";

     pic10on= new Image(150,18);

     pic10on.src="images/overknop-3d-support.gif";

     pic11on= new Image(150,18);

     pic11on.src="images/overknop-industrieel-meetwerk.gif";

     pic12on= new Image(150,18);

     pic12on.src="images/overknop-vacatures.gif";

     pic13on= new Image(150,18);

     pic13on.src="images/overknop-geo-informatica.gif";

     pic14on= new Image(150,18);

     pic14on.src="images/overknop-software.gif";



     pic1off= new Image(18,150);

     pic1off.src="images/knop-bedrijfsprofiel.gif";

     pic2off= new Image(150,18);

     pic2off.src="images/knop-landmeten.gif";

     pic3off= new Image(150,18);

     pic3off.src="images/knop-maatvoeren.gif";

     pic4off= new Image(150,18);

     pic4off.src="images/knop-gps.gif";

     pic5off= new Image(150,18);

     pic5off.src="images/knop-deformatiemeten.gif";

     pic6off= new Image(150,18);

     pic6off.src="images/knop-uitzetten-gww.gif";

     pic7off= new Image(150,18);

     pic7off.src="images/knop-volumebepaling.gif";

     pic8off= new Image(150,18);

     pic8off.src="images/knop-kadaster-informatie.gif";

     pic9off= new Image(150,18);

     pic9off.src="images/knop-inpandige-metingen.gif";

     pic10off= new Image(150,18);

     pic10off.src="images/knop-3d-support.gif";

     pic11off= new Image(150,18);

     pic11off.src="images/knop-industrieel-meetwerk.gif";

     pic12off= new Image(150,18);

     pic12off.src="images/knop-vacatures.gif";  ;

     pic13off= new Image(150,18);

     pic13off.src="images/knop-geo-informatica.gif";

     pic14off= new Image(150,18);

     pic14off.src="images/knop-software.gif";

   }



function lightup(imgName)

 {

   if (document.images)

    {

      imgOn=eval(imgName + "on.src");

      document[imgName].src= imgOn;

    }

 }



function turnoff(imgName)

 {

   if (document.images)

    {

      imgOff=eval(imgName + "off.src");

      document[imgName].src= imgOff;

    }

 }