function get_button_fields(object)
	{
	var button_table = object.childNodes[0];
	if(button_table.childNodes.length == 1)
		{
		var tbody = button_table.childNodes[0];
		}
	else
		{
		var tbody = button_table.childNodes[1];
		}
	var table_row = tbody.childNodes[0];
	var tr_num_objects = table_row.childNodes.length;
 	var fields = new Array();
	for(var i=0;i<tr_num_objects;i++)
		{
		if(table_row.childNodes[i].id)
			{
			fields.push(table_row.childNodes[i]);
			}
		}
	return fields;
	}
function expand(menu_button)
	{
	fields = get_button_fields(menu_button);
	fields[0].style.backgroundImage = "url(images/menu_system/popdown_mb_left.png)";
	fields[1].style.backgroundImage = "url(images/menu_system/popdown_mb_body.png)";
	fields[2].style.backgroundImage = "url(images/menu_system/popdown_mb_right.png)";
	fields[1].firstChild.className = "menu_button_text_o";
	menu_button.lastChild.className = "menu_popdown_e";
	}
function collapse(menu_button)
	{
	fields = get_button_fields(menu_button);
	fields[0].style.backgroundImage = "none";
	fields[1].style.backgroundImage = "none";
	fields[2].style.backgroundImage = "none";
	fields[1].firstChild.className = "menu_button_text";
	menu_button.lastChild.className = "menu_popdown_c";
	}
function rollover(obj)
			{
			obj.backgroundImage = "url(images/menu_system/popdown_over.png)";
			}
function rollout(obj)
			{
			obj.backgroundImage = "url(images/menu_system/popdown_body.png)";
			}