if (document.images) {
    emergoff = new Image();
    emergoff.src = "/img/nav/emerg_off.gif";
    brochureoff = new Image();
    brochureoff.src = "/img/nav/brochure_off.gif";
    specsoff = new Image();
    specsoff.src = "/img/nav/specs_off.gif";
    prodoff = new Image();
    prodoff.src = "/img/nav/prod_off.gif";
    presoff = new Image();
    presoff.src = "/img/nav/pres_off.gif";
    telepieroff = new Image();
    telepieroff.src = "/img/nav/telepier_off.gif";
    newsoff = new Image();
    newsoff.src = "/img/nav/news_off.gif";
    testoff = new Image();
    testoff.src = "/img/nav/test_off.gif";
    aboutoff = new Image();
    aboutoff.src = "/img/nav/about_off.gif";

    emergon = new Image();
    emergon.src = "/img/nav/emerg_on.gif";
    brochureon = new Image();
    brochureon.src = "/img/nav/brochure_on.gif";
    specson = new Image();
    specson.src = "/img/nav/specs_on.gif";
    prodon = new Image();
    prodon.src = "/img/nav/prod_on.gif";
    preson = new Image();
    preson.src = "/img/nav/pres_on.gif";
    telepieron = new Image();
    telepieron.src = "/img/nav/telepier_on.gif";
    newson = new Image();
    newson.src = "/img/nav/news_on.gif";
    teston = new Image();
    teston.src = "/img/nav/test_on.gif";
    abouton = new Image();
    abouton.src = "/img/nav/about_on.gif";
}

// Function to 'activate' images.

function imgOn(imgName) {
	if (document.images) {
	    idName = document.getElementById(imgName);
        idName.src = eval(imgName + "on.src");
	}
}

// Function to 'deactivate' images.

function imgOff(imgName) {
	if (document.images) {
		idName = document.getElementById(imgName);
        idName.src = eval(imgName + "off.src");
	}
}

// Function to create dynamic pop up window, currently set to center window on screen.

function newWindow(url, wid, hgt, scr, res, stat, x, y) {
    if (screen) {
        widthOfScreen = screen.width
        heightOfScreen = screen.height
    }
    midX = widthOfScreen / 2
    midY = heightOfScreen / 2
    midWid = wid / 2
    midHgt = hgt / 2
    x = midX - midWid
    y = midY - midHgt
    popUpWindow = window.open(url, 'popUp', 'width='+wid+',height='+hgt+',scrollbars='+scr+',resizable='+res+',status='+stat+',left='+x+',top='+y+'')
}