function lightbox_popup(url) {
      $.fn.nyroModal.settings.closeButton = '<div class="wrapperTop"><a href="#" class="nyroModalClose" id="closeBut" title="close">CO<sub>2</sub>-Rechner schliessen</a></div><!-- <div class="wrapperTopRight"></div><div class="wrapperBottomLeft"></div><div class="wrapperBottomRight"></div><div class="wrapperTopLeft"></div><div class="wrapperTopRight"></div> -->';
	    $.fn.nyroModalManual({
		  width: 720,
	    height: 610,
		  type: 'iframe',
		  from: {
			href: url
		  }
	    });
		return false;
    };