if (document.images)
   {
     pic1on= new Image(18,150);
     pic1on.src="http://www.coenradie.nl/images/overknop-bedrijfsprofiel.gif";  
     pic2on= new Image(150,18);
     pic2on.src="http://www.coenradie.nl/images/overknop-landmeten.gif"; 
     pic3on= new Image(150,18);
     pic3on.src="http://www.coenradie.nl/images/overknop-maatvoeren.gif"; 
     pic4on= new Image(150,18);
     pic4on.src="http://www.coenradie.nl/images/overknop-gps.gif"; 
     pic5on= new Image(150,18);
     pic5on.src="http://www.coenradie.nl/images/overknop-deformatiemeten.gif"; 
     pic6on= new Image(150,18);
     pic6on.src="http://www.coenradie.nl/images/overknop-uitzetten-gww.gif";
     pic7on= new Image(150,18);
     pic7on.src="http://www.coenradie.nl/images/overknop-volumebepaling.gif"; 
	 pic8on= new Image(150,18);
     pic8on.src="http://www.coenradie.nl/images/overknop-kadaster-informatie.gif"; 
     pic9on= new Image(150,18);
     pic9on.src="http://www.coenradie.nl/images/overknop-inpandige-metingen.gif";
     pic10on= new Image(150,18);
     pic10on.src="http://www.coenradie.nl/images/overknop-3d-support.gif";
     pic11on= new Image(150,18);
     pic11on.src="http://www.coenradie.nl/images/overknop-demonstratie-lixo.gif";
     pic12on= new Image(150,18);
     pic12on.src="http://www.coenradie.nl/images/overknop-geo-informatica.gif";
     pic13on= new Image(150,18);
     pic13on.src="http://www.coenradie.nl/images/overknop-software.gif";

     pic1off= new Image(18,150);
     pic1off.src="http://www.coenradie.nl/images/knop-bedrijfsprofiel.gif";
     pic2off= new Image(150,18);
     pic2off.src="http://www.coenradie.nl/images/knop-landmeten.gif";
     pic3off= new Image(150,18);
     pic3off.src="http://www.coenradie.nl/images/knop-maatvoeren.gif";
     pic4off= new Image(150,18);
     pic4off.src="http://www.coenradie.nl/images/knop-gps.gif";
     pic5off= new Image(150,18);
     pic5off.src="http://www.coenradie.nl/images/knop-deformatiemeten.gif";
     pic6off= new Image(150,18);
     pic6off.src="http://www.coenradie.nl/images/knop-uitzetten-gww.gif";
     pic7off= new Image(150,18);
     pic7off.src="http://www.coenradie.nl/images/knop-volumebepaling.gif";
     pic8off= new Image(150,18);
     pic8off.src="http://www.coenradie.nl/images/knop-kadaster-informatie.gif";
     pic9off= new Image(150,18);
     pic9off.src="http://www.coenradie.nl/images/knop-inpandige-metingen.gif";
     pic10off= new Image(150,18);
     pic10off.src="http://www.coenradie.nl/images/knop-3d-support.gif";
     pic11off= new Image(150,18);
     pic11off.src="http://www.coenradie.nl/images/knop-demonstratie-lixo.gif";
     pic12off= new Image(150,18);
     pic12off.src="http://www.coenradie.nl/images/knop-geo-informatica.gif";
     pic13off= new Image(150,18);
     pic13off.src="http://www.coenradie.nl/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;
    }
 }