function initPage()
{
	var navRoot = document.getElementById("content");
	var lis = navRoot.getElementsByTagName("a");
	var maxwidth = navRoot.offsetWidth;
	for (var i=0; i<lis.length; i++)
	{
		if ((lis[i].className == "button"))
		{
			var butwidth = lis[i].offsetWidth;
			var margin = Math.round((maxwidth - butwidth)/2 - 35);
			lis[i].style.margin = "0 0 0 " + margin + "px";
		}
	}
}

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