function formPrep() {
 if(wgPageName.indexOf("Special:FormEdit") > -1 || wgAction.indexOf("formedit") > -1) {
	function modify_selected_values() {
		var input = $(this).parent().prev('span').children('input');
		var chk_value = this.value;
		var selected_values = input.val() ? input.val().split(/ *, */) : [];
		if(this.checked) {
			selected_values.push(this.value);
			selected_values.sort();
		} else {
			selected_values = $.grep(selected_values, function(value) { return value != chk_value; });
		}
		input.val(selected_values.join(", "));
	}

	function property_list_to_checkboxes() {
		var property_list = this;
		var input = $(this).prev('span').children('input');
		var available_values = $(this).text().split(", ");
		var selected_values = input.val() ? input.val().split(/ *, */) : [];
		$(this).text("");
		var name = "chk_" + input.attr('name');
		$.each(available_values, function() {
			var chk = $('<input type="checkbox" name="' + name + '" value="' + this + '"' + ($.inArray("" + this, selected_values) > -1 ? ' checked="checked"' : '') + ' />');
			$(property_list).append(chk);
			chk.change(modify_selected_values);
			$(property_list).append(document.createTextNode(" " + this + " "));
		});
		$(this).show();
	}

	$(function () {
		$('.property_list').each(property_list_to_checkboxes);
	});
 }
}

addOnloadHook(formPrep);