<!-- code voor dropdown scherm -->


 function showHideItems(myItem, myButton){
var myItem = document.getElementById(myItem);
var myButton = document.getElementById(myButton);
if (myItem.style.display != "none") {
myItem.style.display = "none";
swapImage(myButton,"plus");
}
else {
document.getElementById('item1').style.display = 'none';
document.getElementById('item2').style.display = 'none';
document.getElementById('item3').style.display = 'none';
document.getElementById('item4').style.display = 'none';
document.getElementById('item5').style.display = 'none';
swapImage(document.getElementById('button1'),'plus');
swapImage(document.getElementById('button2'),'plus');
swapImage(document.getElementById('button3'),'plus');
swapImage(document.getElementById('button4'),'plus');
swapImage(document.getElementById('button5'),'plus');
myItem.style.display = "block";
swapImage(myButton,"minus");
}

// regel voor bepaling hoogte:
window.top.calcHeight();
}



function swapImage(myImage, state) {
if (state == "minus") {
myImage.src = "images/minus.gif";
}
else {
myImage.src = "images/plus.gif";
}
}