/**
 * Traverse all p-tags whose id starts with 'faq_', hide them, except
 * the id == 'faq_'+to_show
 *
 * @param to_show which P-tag should be shown?
 */
function showAndHideFAQ(to_show)
{
	elems = document.getElementsByTagName("P");
	for (i = 0; i < elems.length; ++i) {
		if (elems[i] != null) {
			idvalue = elems[i].id;
			if (idvalue!= null) {
				var id = idvalue;
				if (id.substring(0,4) == 'faq_') {
					var faq_id = id.substring(4);
					if (faq_id == to_show) {
						showElemById(id);
					}
					else {
						hideElemById(id);
					}
				}
			}
		}
	}
}

function hideElemById(id)
{
	elem = document.getElementById(id);
	if (elem != null) {
		elem.style.visibility = "hidden";
		elem.style.display = "none";
	}
}

function showElemById(id)
{
	elem = document.getElementById(id);
	if (elem != null) {
		elem.style.visibility = "visible";
		elem.style.display = "block";
	}
}