SurveyPrevWin=null;
function KV2PreviewSurvey(idSurvey)
{
	if(!SurveyPrevWin)
	{
		SurveyPrevWin= window.open('/k/preview.aspx?k='+idSurvey+'&u=1&validate=false','','width=780,height=600,scrollbars=yes');
	} 
	else
	{ 
		SurveyPrevWin.close();SurveyPrevWin=null;
		SurveyPrevWin = window.open('/k/preview.aspx?k=' + idSurvey + '&u=1&validate=false', '', 'width=780,height=600,scrollbars=yes');
	}
}