function initNavigation()
{
	var _menu = document.getElementById("navigation");
	if(_menu) {
		var _menuWidth = _menu.offsetWidth;
		var _parentWidth = _menu.parentNode.offsetWidth;
		var _diff = Math.round((_parentWidth - _menuWidth) / 2);

		_menu.style.marginLeft = _diff + "px";

	}
}

if (window.addEventListener) window.addEventListener("load", initNavigation, false);
else if (window.attachEvent) window.attachEvent("onload", initNavigation);