sfHover = function() {
	if ( document.getElementById("leftnav") ) {
		var sfEls = document.getElementById("leftnav").getElementsByTagName("LI");
		for (var i=0; i<sfEls.length; i++) {
			sfEls[i].onmouseover=function() {
				this.className+=" sfhover";
			}
			sfEls[i].onmouseout=function() {
				this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
			}
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);

/**
 * hide
 */
function hide(e) {
  e.style.visibility = 'hidden';
  e.style.display = 'none';
}

/**
 * show
 */
function show(e) {
  e.style.visibility = 'visible';
  e.style.display = 'block';
}

/**
 * toggle_visibility
 */
function toggle_visibility(e) {
	if ( e.style.display == 'none' ||  e.style.display == '' ) show(e);
	else hide(e);
}

function index_switchtab(id) {
	if ( id == 'z' ) {
		hide(document.getElementById('tab_nieuwsbrief_form'));
		document.getElementById('tab_nieuwsbrief_url').className = 'inactive';
		show(document.getElementById('tab_zoeken_form'));
		document.getElementById('tab_zoeken_url').className = 'active';
	}
	else {
		hide(document.getElementById('tab_zoeken_form'));
		document.getElementById('tab_zoeken_url').className= 'inactive';
		show(document.getElementById('tab_nieuwsbrief_form'));
		document.getElementById('tab_nieuwsbrief_url').className = 'active';			
	}
	return false;
}

function popup_stuurdoor(w) {
	win = window.open(w, "stuurdoor", "resizable=yes, scrollbars=no, width=478, height=278, top=50, left=50");
  win.focus();
  return false;
}