function laagzichtbaar(strLayer, strImage) {
var varLayer = getLayer(strLayer);
if (varLayer) {
varLayer.visibility = 'visible';
}
}

function laagnietzichtbaar(strLayer, strImage) {
var varLayer = getLayer(strLayer);
varLayer.visibility = 'hidden';
}

function dynamic_image_on(imgName, strLayer) {
if (strLayer != 'geenmenu') {
	laagzichtbaar(strLayer);
  }
}

function dynamic_image_off(imgName, strLayer) {
if (strLayer != 'geenmenu') {
 laagnietzichtbaar(strLayer);
  }

}

function getLayer(name) {
if (document.getElementById) {
return document.getElementById(name).style;
}
else if (document.all) {
return document.all[name].style;
}
else if (document.layers) {
return document.layers[name];
}
}