AA_DOM = (document.getElementById) ? true : false;
AA_NS4 = (document.layers) ? true : false;
AA_IE = (document.all) ? true : false;
AA_IE4 = AA_IE && !AA_DOM;
AA_NS6 = AA_DOM && !AA_IE;
AA_Mac = (navigator.appVersion.indexOf("Mac") != -1);
AA_IE4M = AA_IE4 && AA_Mac;
AA_Opera = (navigator.userAgent.indexOf("Opera")!=-1);
AA_Konqueror = (navigator.userAgent.indexOf("Konqueror")!=-1);

AA_IsMenu = !AA_Konqueror && !AA_IE4M && !AA_Opera && (AA_DOM || AA_NS4 || AA_IE4 );
AA_BrowserString = AA_NS4 ? "NS4" : AA_DOM ? "DOM" : "IE4";

<!-- Change arrows to correct section -->
AA_PG_ImageSrc = "/images/buttons/arrow_blue.gif";
AA_PG_ImageSrcOver = "/images/buttons/arrow_blue.gif";

function AA_f_CenterMenu(topmenuid) {
	var MinimumPixelLeft = 0;
	var TheMenu = AA_DOM ? document.getElementById(topmenuid) : AA_IE4 ? document.all(topmenuid) : eval("window." + topmenuid);
	var TheMenuWidth = AA_DOM ? parseInt(TheMenu.style.width) : AA_IE4 ? TheMenu.style.pixelWidth : TheMenu.clip.width;
	var TheWindowWidth = AA_IE ? document.body.clientWidth : window.innerWidth;
	var ReturnValue =  Math.max(parseInt((TheWindowWidth-TheMenuWidth) / 2),MinimumPixelLeft);
	
	if(AA_NS4) { ReturnValue -=11}
	else if(AA_NS6) { ReturnValue -=8}
	return ReturnValue;
}

if(AA_IsMenu) {
document.write("<SCR" + "IPT LANGUAGE='JavaScript1.2' SRC='/javascript/menu/AA_Arrays.js' TYPE='text/javascript'><\/SCR" + "IPT>");
	document.write("<SCR" + "IPT LANGUAGE='JavaScript1.2' SRC='/javascript/menu/AA_Script"+ AA_BrowserString +".js' TYPE='text/javascript'><\/SCR" + "IPT>");
}