function Is ()
{   // convert all characters to lowercase to simplify testing
    var agt=navigator.userAgent.toLowerCase()

    // --- BROWSER VERSION ---
    this.major = parseInt(navigator.appVersion)
    this.minor = parseFloat(navigator.appVersion)

    this.nav  = ((agt.indexOf('mozilla')!=-1) && ((agt.indexOf('spoofer')==-1)
                && (agt.indexOf('compatible') == -1)))
    this.nav2 = (this.nav && (this.major == 2))
    this.nav3 = (this.nav && (this.major == 3))
    this.nav4 = (this.nav && (this.major == 4))

    this.ie   = (agt.indexOf("msie") != -1)
    this.ie3  = (this.ie && (this.major == 2))
    this.ie4  = (this.ie && (this.major == 4))

    this.opera = (agt.indexOf("opera") != -1)
     
    this.nav4up = this.nav && (this.major >= 4)
    this.ie4up  = this.ie  && (this.major >= 4)
}

var is = new Is();

if (is.major >="3")
{
downloads_over=new Image(156,295);
downloads_over.src="../images/backstage2/nav_ctl/nav_downloads.gif";

cast_over=new Image(156,295);
cast_over.src="../images/backstage2/nav_ctl/nav_cast.gif";

fansites_over=new Image(156,295);
fansites_over.src="../images/backstage2/nav_ctl/nav_fansites.gif";

contests_over=new Image(156,295);
contests_over.src="../images/backstage2/nav_ctl/nav_contests.gif";

shopping_over=new Image(156,295);
shopping_over.src="../images/backstage2/nav_ctl/nav_shopping.gif";

questions_over=new Image(156,295);
questions_over.src="../images/backstage2/nav_ctl/nav_questions.gif";

default_off=new Image(156,295);
default_off.src="../images/backstage2/nav_ctl/nav_logo.gif";
}

if (is.major < "4")
{
	alert("We recommend you upgrade to the latest browsers from either Microsoft or Netscape");
}

function OnMouseOver(imgName)
{
	if (is.major >="3")
	{
		document["nav"].src=eval(imgName + "_over.src");
	}
}
function OnMouseOut(imgName)
{
	if (is.major >="3")
	{
		document["nav"].src=eval(imgName + "_off.src");
	}
}