var timer=0;
var postcode=null;
var callbackInProgress=false;

function activatePart()
{
    for (var index=0; index < formPartIDs.length; index++)
    {
        var container = document.getElementById(formPartIDs[index]);
        if (null != container) {
            if (container.id == activeFormPartId) {
                container.style.display = 'block';
                container.className = 'userFormsContainerExpanded';
                container.previousSibling.className = 'userFormsHeaderExpanded';
            }
            else {
                container.style.display = 'none';
                container.className = 'userFormsContainerCollapsed';
                container.previousSibling.className = 'userFormsHeaderCollapsed';
            }
        }
    }        
}

function onUserFormsDropDownSelectionChanged(clientId) {
    if (document.getElementById(clientId).options[0].value == 'maakkeuze') {
        document.getElementById(clientId).options[0] = null;
    }
}