var IE = document.all ? true : false;
if (IE) {
	document.write('<link rel="stylesheet" type="text/css" href="css/ie.css">');
}
else {
	document.write('<link rel="stylesheet" type="text/css" href="css/ns.css">');
}

function rollOver(which,state) {
        if (document.images) {
                ext = which.src.substring(which.src.lastIndexOf("."));
                which.src = which.src.substring(0,which.src.lastIndexOf('_')) + "_" + state + ext;
        }
}

function rollOver_paren(which,state) {
	paren = document.getElementById(which);
	rollOver(paren, state);
}

var topNavCurr;
var topNavVis = false;

function showTopNav(which,state) {
	if (state) {
	if (!topNavVis) {
		document.getElementById("topNavMenu" + which).style.visibility = 'visible';
		document.getElementById("topnavClear").style.visibility = 'visible';
		topNavCurr = which;
		topNavVis = true;
	} 
	} else {
		document.getElementById("topNavMenu" + topNavCurr).style.visibility = 'hidden';
		document.getElementById("topnavClear").style.visibility = 'hidden';
		topNavVis = false;
	}		
}


function refWin(mark) {
	var url = "references.html#" + mark;
	var w = 570;
	var h = 450;
	var name = "references";
	var t = 0;
	var m = 0;
	var s = 1;
	var r = 0;
	var st = 0;
	var l = 0;
	var d = 0;
	var c = 0;
	var windowOptions = "width=" + w + "," +
	"height=" + h + "," +
	"toolbar=" + t + "," +
	"menubar=" + m +"," +
	"scrollbars=" + s + "," +
	"resizable=" + r + "," +
	"status=" + st + "," +
	"location=" + l + "," +
	"directories=" + d + "," +
	"copyhistory=" + c;
	window.open(url, name, windowOptions);
}