function getObject(objectId) {
  // checkW3C DOM, then MSIE 4, then NN 4.
    if(document.getElementById && document.getElementById(objectId)) {
        return document.getElementById(objectId);
    } else if (document.all && document.all(objectId)) {  
        return document.all(objectId);
    } else if (document.layers && document.layers[objectId]) { 
        return document.layers[objectId];
    } else {
        return false;
   }
}


function changeImage(objectName, src) {
    getObject(objectName).src='bilder/'+src;
}

function resetImage(objectName) {
    getObject(objectName).src='images/'+objectName+'.gif';
}

function toggle(objectName) {
	var obj = getObject(objectName);
	obj.style.display = (obj.style.display != 'none' ? 'none' : 'block' );
}