function openAns(Num) {
	var ansName = "ans" + Num;
 subCategory = document.getElementById(ansName).style;
 if(subCategory.display == 'none') subCategory.display = "block"
 else subCategory.display = "none"
 
 var catName = "guidecat0" + Num;
 catActive = document.getElementById(catName).style;
 if(catActive.visibility == 'hidden') catActive.visibility = "visible"
 else catActive.visibility = "hidden"
}