<!-- 
function newImage( imgSrc ){

 var imgName = new Image();
 imgName.src = imgSrc;

 return imgName;

}

function change( imgName, imgLocation )
{
 document[imgName].src = imgLocation ;
}

var preloadFlag = false;
function loadImages()
{
 if (document.images)
 {
 knop_02 = newImage("images/buttons/knop_02_over.png");
 knop_03 = newImage("images/buttons/knop_03_over.png");
 knop_04 = newImage("images/buttons/knop_04_over.png");
 knop_05 = newImage("images/buttons/knop_05_over.png");
 knop_06 = newImage("images/buttons/knop_06_over.png");
 knop_07 = newImage("images/buttons/knop_07_over.png")

 preloadFlag = true;
 }
} 
//-->