function layer(url) {
    if($('popup')) popupsulje();
    sulje = new Element('a',{'id':'popupsulje', 'href':'javascript:popupsulje()'});
    popup = new Element('div',{'id':'popup'});
    content = new Element('div',{'class':'content'});
    new Ajax.Request (url, {
    onSuccess: function(transport) {
        content.update(transport.responseText);
        
        popup.appendChild(content);
        popup.appendChild(sulje);
        
        $('contentArea').appendChild(popup);
                
        }
    });
}

function popupsulje() {
    $('popup').remove();
}