--- trunk/hide.js	2004/09/12 02:18:42	14
+++ trunk/hide.js	2004/09/12 18:25:03	15
@@ -1,15 +1,46 @@
-function toggle_display(name) {
+var changed_display_ids = [];
+var changed_display_pos = 0;
+
+function toggle_display(name,dont_save) {
 	var el = eval("document.getElementById('"+name+"')");
 	if (el) {
 		if (el.style.display=='none')
 			el.style.display = '';
 		else
 			el.style.display = 'none';
+
+		if (! dont_save) changed_display_ids[changed_display_pos++] = name;
 	}
 
 	return false;
 }
 
+function apply_changed_display() {
+	for (var i = 0; i <= changed_display_pos; i++) {
+		toggle_display( changed_display_ids[i], 1 );
+	}
+	changed_display_pos = 0;
+	return false;
+}
+
+function back_display() {
+	if (changed_display_pos == 0) {
+		alert("can't go back in history");
+		return;
+	}
+	toggle_display( changed_display_ids[--changed_display_pos], 1 );
+}
+
+function forward_display() {
+	if (changed_display_pos == changed_display_ids.length) {
+		alert("can't go forward in history");
+		return;
+	}
+
+	toggle_display( changed_display_ids[changed_display_pos++], 1 );
+}
+
+
 function set_display(name,display) {
 	var el = eval("document.getElementById('"+name+"')");