function toggle_visibility(id) {
   var e = document.getElementById(id);
   if(e.style.display == 'block')
      e.style.display = 'none';
   else
      e.style.display = 'block';
}
    
    
function sitesurveyswitch(emotion) {

	var e = emotion;

	document.getElementById('site_survey_hate').style.backgroundPosition = '0px 0px';
	document.getElementById('site_survey_ok').style.backgroundPosition = '0px 0px';
	document.getElementById('site_survey_love').style.backgroundPosition = '0px 0px';
	document.getElementById('FeedbackHate').style.display = 'none';
	document.getElementById('FeedbackOk').style.display = 'none';
	document.getElementById('FeedbackLove').style.display = 'none';
		
	if (e == 'hate') {
		document.getElementById('site_survey_hate').style.backgroundPosition = '-80px 0px';
		document.getElementById('FeedbackHate').style.display = 'block';
	}
	if (e == 'ok') {
		document.getElementById('site_survey_ok').style.backgroundPosition = '-80px 0px';
		document.getElementById('FeedbackOk').style.display = 'block';
	}
	if (e == 'love') {
		document.getElementById('site_survey_love').style.backgroundPosition = '-80px 0px';
		document.getElementById('FeedbackLove').style.display = 'block';
	}
}