var $overlay_wrapper;
var $overlay_panel;

function show_overlay() {
    if ( !$overlay_wrapper ) append_overlay();
    $overlay_wrapper.fadeIn(700, callback_function);
	setInterval('aftellen()',1000);

}

	var seconden=31;
    function aftellen() {
		seconden=seconden-1;
		document.getElementById('teller').innerHTML =   + seconden ;
     };


var callback_function = function(){
	$(this).delay(30000, function(){
	$overlay_wrapper.fadeOut(500);
	//$('#overlay').css('display', 'none');
	});
}

function hide_overlay() {
    $overlay_wrapper.fadeOut(500);
}

function hide_overlay2(deze) {
	$overlay_wrapper.fadeOut(500);
}

function append_overlay() {
    $overlay_wrapper = $('<div id="overlay"></div>').appendTo( $('BODY') );
    $overlay_panel = $('<div id="overlay-panel"></div>').appendTo( $overlay_wrapper );

    //$overlay_panel.html( '<p>This is the overlay content</p><a href="#" class="hide-overlay">Close Overlay</a><p>This is the overlay content</p><a href="http://www.google.nl">http://www.google.nl</a><br>Dit venster sluit automatisch in <span id="teller">5</span> seconden.' );
	$overlay_panel.html(strHTML);

    attach_overlay_events();
}

function attach_overlay_events() {
    $('A.hide-overlay', $overlay_wrapper).click( function(ev) {
        ev.preventDefault();
        hide_overlay();
    });
}

$(function() {
    $('A.show-overlay').click( function(ev) {
        ev.preventDefault();
        show_overlay();
    });
});