function surveyPopup(url){
	var winWidth = 600;
	var winHeight = 500;
	var popup = window.open(url, 'popupWindow','resize=1,scrollbars=1,top=' + Math.round(document.body.clientHeight/2 - winHeight/2) + ',left=' + Math.round(document.body.clientWidth/2 - winWidth/2) + ',width=' + winWidth + ',height=' + winHeight);
	popup.focus();
	return true;
}