--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/collapse.js	Tue Dec 23 14:28:28 2008 +0100
@@ -0,0 +1,77 @@
+// $Id: collapse.js,v 1.17 2008/01/29 10:58:25 goba Exp $
+
+/**
+ * Toggle the visibility of a fieldset using smooth animations
+ */
+Drupal.toggleFieldset = function(fieldset) {
+  if ($(fieldset).is('.collapsed')) {
+    // Action div containers are processed separately because of a IE bug
+    // that alters the default submit button behavior.
+    var content = $('> div:not(.action)', fieldset);
+    $(fieldset).removeClass('collapsed');
+    content.hide();
+    content.slideDown( {
+      duration: 'fast',
+      easing: 'linear',
+      complete: function() {
+        Drupal.collapseScrollIntoView(this.parentNode);
+        this.parentNode.animating = false;
+        $('div.action', fieldset).show();
+      },
+      step: function() {
+        // Scroll the fieldset into view
+        Drupal.collapseScrollIntoView(this.parentNode);
+      }
+    });
+  }
+  else {
+    $('div.action', fieldset).hide();
+    var content = $('> div:not(.action)', fieldset).slideUp('fast', function() {
+      $(this.parentNode).addClass('collapsed');
+      this.parentNode.animating = false;
+    });
+  }
+};
+
+/**
+ * Scroll a given fieldset into view as much as possible.
+ */
+Drupal.collapseScrollIntoView = function (node) {
+  var h = self.innerHeight || document.documentElement.clientHeight || $('body')[0].clientHeight || 0;
+  var offset = self.pageYOffset || document.documentElement.scrollTop || $('body')[0].scrollTop || 0;
+  var posY = $(node).offset().top;
+  var fudge = 55;
+  if (posY + node.offsetHeight + fudge > h + offset) {
+    if (node.offsetHeight > h) {
+      window.scrollTo(0, posY);
+    } else {
+      window.scrollTo(0, posY + node.offsetHeight - h + fudge);
+    }
+  }
+};
+
+Drupal.behaviors.collapse = function (context) {
+  $('fieldset.collapsible > legend:not(.collapse-processed)', context).each(function() {
+    var fieldset = $(this.parentNode);
+    // Expand if there are errors inside
+    if ($('input.error, textarea.error, select.error', fieldset).size() > 0) {
+      fieldset.removeClass('collapsed');
+    }
+
+    // Turn the legend into a clickable link and wrap the contents of the fieldset
+    // in a div for easier animation
+    var text = this.innerHTML;
+      $(this).empty().append($('<a href="#">'+ text +'</a>').click(function() {
+        var fieldset = $(this).parents('fieldset:first')[0];
+        // Don't animate multiple times
+        if (!fieldset.animating) {
+          fieldset.animating = true;
+          Drupal.toggleFieldset(fieldset);
+        }
+        return false;
+      }))
+      .after($('<div class="fieldset-wrapper"></div>')
+      .append(fieldset.children(':not(legend):not(.action)')))
+      .addClass('collapse-processed');
+  });
+};