/* == Algorithm for show/unshow ==
   Each hint/file is given a number, hint# or file#
   When we say showOnly with a class name we add the rules to
   the css #content div {display:none}, #content div.className {display:block}
   When going back to showAll we remove these results
*/

/* CSS utils */
function css_del(n) {
	var css = document.styleSheets[0];
	for (var i = 0; i < n; i++)
		css.deleteRule(css.cssRules.length-1);
}

function css_add(s) {
	var css = document.styleSheets[0];
	css.insertRule(s, css.cssRules.length);
}

/* Show/Hide logic */
var last = "";
function show(id) {
	if (id == last) return;
	if (id == "") {
		css_del(3);
		css_add(".errors-all {font-weight: bold;}");
	}
	else {
		if (last == "") {
			css_del(1);
			css_add(".errors-content > ol > li {display:none;}");
		}
		else {
			css_del(2);
		}
		css_add(".errors-content > ol > li." + id + " {display:list-item;}");
		css_add("#" + id + "{font-weight:bold;}");
	}
	last = id;
}