var dom = document.getElementById ? 1 : 0; // DOM1 supported?

//HTML elements Visible change

function showElement(id)
{
    var elm = document.getElementById(id);
    elm.style.display = 'block';
}

function hideElement(id)
{
    var elm = document.getElementById(id);
    elm.style.display = 'none';
}

function getCookie(name) {
    var dc = document.cookie;
    var prefix = name + "=";
    var begin = dc.indexOf("; " + prefix);
    if (begin == -1) {
        begin = dc.indexOf(prefix);
        if (begin != 0) return null;
    } else {
        begin += 2;
    }
    var end = document.cookie.indexOf(";", begin);
    if (end == -1) {
        end = dc.length;
    }
    return unescape(dc.substring(begin + prefix.length, end));
}

function hideAll()
{
    hideElement('mnu_alg');
    hideElement('mnu_po');
    hideElement('werving_po');
    hideElement('alg_po');
    hideElement('inwerk_po');
    hideElement('beoordelen_po');
    hideElement('belonen_po');
    hideElement('ontwikkelen_po');
    hideElement('vertrek_po');
	hideElement('arbeidsomstandigheden_po');

    hideElement('mnu_dl');
    hideElement('mnu_lv');
    showElement(getCookie('lastmenu'));
    if (getCookie('lastmenu') == 'werving_po') {
      showElement('mnu_po');
    }
    if (getCookie('lastmenu') == 'alg_po') {
      showElement('mnu_po');
    }
    if (getCookie('lastmenu') == 'inwerk_po') {
      showElement('mnu_po');
    }
    if (getCookie('lastmenu') == 'beoordelen_po') {
      showElement('mnu_po');
    }
    if (getCookie('lastmenu') == 'belonen_po') {
      showElement('mnu_po');
    }
    if (getCookie('lastmenu') == 'ontwikkelen_po') {
      showElement('mnu_po');
    }
    if (getCookie('lastmenu') == 'vertrek_po') {
      showElement('mnu_po');
    }
    if (getCookie('lastmenu') == 'arbeidsomstandigheden_po') {
      showElement('mnu_po');
    }
}

function toggleElement(id)
{
    hideElement('mnu_alg');
    hideElement('mnu_po');

    hideElement('mnu_dl');
    hideElement('mnu_lv');
    var elm = document.getElementById(id);
    elm.style.display = (elm.style.display == 'none') ? 'block' : 'none';
    document.cookie = "lastmenu=" + id;
}

function togglesubElement(id)
{
    hideElement('werving_po');
    hideElement('alg_po');
    hideElement('inwerk_po');
    hideElement('beoordelen_po');
    hideElement('belonen_po');
    hideElement('ontwikkelen_po');
    hideElement('vertrek_po');
    hideElement('arbeidsomstandigheden_po');	
    showElement('mnu_po');
    var elm = document.getElementById(id);
    elm.style.display = (elm.style.display == 'none') ? 'block' : 'none';
    document.cookie = "lastmenu=" + id;
}



function setCookie(name, value, expires, path, domain, secure) {
    document.cookie= name + "=" + escape(value) +
        ((expires) ? "; expires=" + expires.toGMTString() : "") +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        ((secure) ? "; secure" : "");
}

function deleteCookie(name, path, domain) {
    if (getCookie(name)) {
        document.cookie = name + "=" +
            ((path) ? "; path=" + path : "") +
            ((domain) ? "; domain=" + domain : "") +
            "; expires=Thu, 01-Jan-70 00:00:01 GMT";
    }
}