Index: branches/RC/themes/default2007/platform/inc/script.js
===================================================================
diff -u -r8929 -r9021
--- branches/RC/themes/default2007/platform/inc/script.js	(.../script.js)	(revision 8929)
+++ branches/RC/themes/default2007/platform/inc/script.js	(.../script.js)	(revision 9021)
@@ -1,3 +1,5 @@
+String.prototype.trim = function() { return this.replace(/^\s+|\s+$/, ''); };
+
 function update_checkbox(cb, cb_hidden) {
 	cb_hidden.value = cb.checked ? 1 : 0;
 }
@@ -9,4 +11,83 @@
 function open_window($url, $window_name, $width, $height) {
 	window.open($url, $window_name, 'width='+$width+',height='+$height+',resizable=yes');
 	return false;
+}
+
+// ItemCategories class
+function ItemCategories($table_id, $field_id, $primary_category) {
+	this.CategoryTable = document.getElementById($table_id);
+	this.CategorySelector = document.getElementById($field_id + '_select');
+	this.MoreCategoriesField = document.getElementById($field_id);
+	this.PrimaryCategory = $primary_category;
+
+	// get additional categories from item
+	if (this.MoreCategoriesField.value.length) {
+		this.MoreCategories = this.MoreCategoriesField.value;
+		this.MoreCategories = this.MoreCategories.substring(1, this.MoreCategories.length - 1).split('|');
+	}
+	else {
+		this.MoreCategories = new Array ();
+	}
+}
+
+ItemCategories.prototype.AddCategory = function($separator, $delete_button) {
+	var $category_id = this.CategorySelector.options[this.CategorySelector.selectedIndex].value;
+	var $category_name = this.CategorySelector.options[this.CategorySelector.selectedIndex].innerHTML.trim();
+
+	if ((this.SearchCategory($category_id) !== false) || ($category_id == this.PrimaryCategory) || ($category_id == 0)) {
+		// don't add same category twice & don't allow to add item's primary category
+		return ;
+	}
+
+	// strip trailing HTML spaces & separator
+	var $separator_pos = $category_name.indexOf($separator);
+	if ($separator_pos != -1) {
+		$category_name = $category_name.substring($separator_pos + $separator.length);
+	}
+
+
+	var $row = this.CategoryTable.insertRow(-1);
+	$row.id = 'category_' + $category_id;
+
+	var $cell = $row.insertCell(-1);
+	$cell.innerHTML = $category_name;
+
+	$cell = $row.insertCell(-1);
+	$cell.innerHTML = $delete_button.replace(/#CATEGORY_ID#/g, $category_id);
+
+	this.MoreCategories.push($category_id);
+	this.updateMoreCategoriesField();
+}
+
+ItemCategories.prototype.SearchCategory = function($category_id) {
+	var $i = 0;
+	while ($i < this.CategoryTable.rows.length) {
+		if (this.CategoryTable.rows[$i].id == 'category_' + $category_id) {
+			return $i;
+		}
+		$i++;
+	}
+
+	return false;
+}
+
+ItemCategories.prototype.DeleteCategory = function($category_id) {
+	var $row_index = this.SearchCategory($category_id);
+
+	if ($row_index !== false) {
+		this.CategoryTable.deleteRow($row_index);
+		var $i = 0;
+		while ($i < this.MoreCategories.length) {
+			if (this.MoreCategories[$i] == $category_id) {
+				this.MoreCategories.splice($i, 1);
+				break;
+			}
+			$i++;
+		}
+		this.updateMoreCategoriesField();
+	}
+}
+
+ItemCategories.prototype.updateMoreCategoriesField = function() {
+	this.MoreCategoriesField.value = this.MoreCategories.length ? '|' + this.MoreCategories.join('|') + '|' : '';
 }
\ No newline at end of file