document.observe('dom:loaded', function () {
	
	//RESORTABLE CATEGORIES
	Sortable.create('sortable_categories', {scroll:window, tag:'div', handle: 'cat_handle', 
		onUpdate: function () {
				//save the new items order
				new Ajax.Request('/content/networks/discussion-forum/ajax/php/update_categories_order.php', 
					{
						method: 'post',
						parameters: $H({
							order: Sortable.serialize("sortable_categories")
						})
					}
				);
		}
	});
	
});

//COLLAPSABLE CATEGORIES
function col_category(category, element) {
	Effect.toggle(category, "Blind");
	if (element.down().readAttribute("image") == "collapse") {
		new Ajax.Request('/content/networks/discussion-forum/ajax/php/update_collapsed_categories.php', 
			{
				method: 'get',
				parameters: $H({
					category_id: element.down().readAttribute('catid'),
					collapsed: 0
				})
			}
		);
		element.down().src = "/images/main/expand.png";
		element.down().writeAttribute("image", "expand");
		} else {
		new Ajax.Request('/content/networks/discussion-forum/ajax/php/update_collapsed_categories.php', 
			{
				method: 'get',
				parameters: $H({
					category_id: element.down().readAttribute('catid'),
					collapsed: 1
				})
			}
		);
		element.down().src = "/images/main/collapse.png";
		element.down().writeAttribute("image", "collapse");
	}
}