--- trunk/hide.js	2004/09/12 18:25:03	15
+++ trunk/hide.js	2004/09/12 19:08:43	16
@@ -1,8 +1,28 @@
+/*
+	simple yet powerful implementation of show/hide effect
+	with history navigation (back/forward/default)
+
+	Dobrica Pavlinusic <dpavlin@rot13.org> 2004-09-12
+*/
+
 var changed_display_ids = [];
 var changed_display_pos = 0;
+var id_cache = [];
+
+function element_id(id) {
+	if (id_cache[id]) {
+		return id_cache[id];
+	} else {
+		var el = document.getElementById(id);
+		if (el) {
+			id_cache[id] = el;
+			return el;
+		}
+	}
+}
 
 function toggle_display(name,dont_save) {
-	var el = eval("document.getElementById('"+name+"')");
+	var el = element_id(name);
 	if (el) {
 		if (el.style.display=='none')
 			el.style.display = '';
@@ -15,7 +35,7 @@
 	return false;
 }
 
-function apply_changed_display() {
+function default_display() {
 	for (var i = 0; i <= changed_display_pos; i++) {
 		toggle_display( changed_display_ids[i], 1 );
 	}
@@ -40,9 +60,13 @@
 	toggle_display( changed_display_ids[changed_display_pos++], 1 );
 }
 
+function reset_changed() {
+	changed_display_ids.length = 0;
+	changed_display_pos = 0;
+}
 
 function set_display(name,display) {
-	var el = eval("document.getElementById('"+name+"')");
+	var el = element_id(name);
 
 	if (el) el.style.display = display
 	else alert("can't set_display("+name+","+display+")");
@@ -54,12 +78,14 @@
 	for (var i = 0; i < show.length; i++) {
 		set_display(show[i],'');
 	}
+	reset_changed();
 }
 
 function hide_display(hide) {
 	for (var i = 0; i < hide.length; i++) {
 		set_display(hide[i],'none');
 	}
+	reset_changed();
 }
 
 function show_hide_display(show,hide) {