var ns = (document.layers )? true : false
var ie = (document.all) ? true : false
var dom = (document.getElementById) ? true : false;
var dP = 2;	// down or right (px)
var dN = -2;	// up or left	(px)
var moving = false;

var browser = document.images;
var imgPath = "./images/";

// simplify creation of image objects
function initImgObj(objName,imgPrefix,imgName,imgType,single) {
	if (single) {
		eval("IMG" + objName + " = new Image()");
		eval("IMG" + objName + ".src = '"  + imgPath + imgPrefix + "." + imgName + ".' + imgType");
		return;
		}

	eval("IMG" + objName + "_0 = new Image()");
	eval("IMG" + objName + "_0.src = '"  + imgPath + imgPrefix + "." + imgName + ".0.' + imgType");
	eval("IMG" + objName + "_1 = new Image()");
	eval("IMG" + objName + "_1.src = '"  + imgPath + imgPrefix + "." + imgName + ".1.' + imgType");
	} // END: initImgObj()

function mOver(x) {
	if (browser) eval("document.NAV" + x + ".src = IMG" + x + "_1.src");
	} // END: mOver()

function mOut(x) {
	if (browser) eval("document.NAV" + x + ".src = IMG" + x + "_0.src");
	} // END: mOut()

	
//pop window functrion
function popWin(location) {
	var ie = (navigator.appName.indexOf("Explorer") > -1) ? true : false;

	var url = location;

	var winWidth = 500;
	var winHeight = 150;
	
	var centerX = screen.availWidth / 2;
	var centerY = screen.availHeight / 2;

	var popWinLeft = parseInt(centerX - (winWidth/2)) ;
	var popWinTop = parseInt(centerY - (winHeight/2));

	if (ie) {
		var innerWidth = document.body.clientWidth;
		var innerHeight = document.body.clientHeight;
	} else {
		var innerWidth = window.innerWidth;
		var innerHeight = window.innerHeight;
		}

	var popWin = window.open(url,'popWin','height=' + winHeight + ',width=' + winWidth + ',status=no,scrollbars=no');
	popWin.moveTo(popWinLeft,popWinTop);
	popWin.focus();
	}

	
	
function loadImages() {
	initImgObj('products','nav', 'products','gif');
	initImgObj('technology','nav','technology','gif');
	initImgObj('faq','nav','faq','gif');
	initImgObj('applications','nav','applications','gif');
	initImgObj('press','nav','press','gif');
	initImgObj('contact','nav','contact','gif');
	initImgObj('museums','nav','museums','gif');
	initImgObj('marketing','nav','marketing','gif');
	initImgObj('signage','nav','signage','gif');
	initImgObj('shows','nav','shows','gif');
	initImgObj('special','nav','special','gif');
	} // END: loadImages()