window.onload = function() {
		var qs = new Querystring();
		var page = qs.get('pid');
		if(page)
			showSubMenu(page);
};

document.getElementsByClassName = function(cl) {
	var retnode = [];
	var myclass = new RegExp('\\b'+cl+'\\b');
	var elem = this.getElementsByTagName('*');
	for (var i = 0; i < elem.length; i++) {
		var classes = elem[i].className;
		if (myclass.test(classes)) retnode.push(elem[i]);
	}
	return retnode;
};
function showSubMenu(id) {
	var obj = document.getElementById(id);
	if(!obj) 
		id = sub_items[id];
	var submenus = document.getElementsByClassName('submenu');
	for(i = 0; i < submenus.length; i++)
		if (submenus[i].id == id) 
			submenus[i].style.display = 'block';
		else
			submenus[i].style.display = 'none';
}