// Global variables
var isCSS 		= false;
var isW3C 		= false;
var isIE4 		= false;
var isNN4 		= false;
var isIE6 		= false;
var isGecko 		= false;
var isOpera 		= false;
var isDHTML 		= false;
var suppressMenus	= false;
var legacyMode		= false;
var timerID		= null;
var subtimerID		= null;

// initialize upon load to let all browsers establish content objects
function autoconfig()
{
    if(document && document.images)
    {
        isCSS		= (document.body && document.body.style) ? true : false;
        isW3C		= (isCSS && document.getElementById) ? true : false;
        isIE4		= (isCSS && document.all && readIEVer() >= 4.0) ? true : false;
        isNN4		= (document.layers) ? true : false;
        isGecko		= (isCSS && navigator && navigator.product && navigator.product == "Gecko");
        isOpera		= (isCSS && navigator.userAgent.indexOf( "Opera") != -1 );
	isIE6CSS	= (document.compatMode && document.compatMode.indexOf("CSS1") >= 0) ? true : false;
	isIE6		= ( isIE6CSS && readIEVer() >= 6.0 );
        isDHTML		= isCSS && ( isIE4 || isGecko || isOpera );
        
        if( suppressMenus || ( isOpera && readOperaVer() < 7 ) || ( isGecko && navigator.productSub <= 20011022 ) || ( isGecko && navigator.productSub == 20030107 ) )
        {

			isDHTML	= false;
        }
    }
}

function readIEVer()
{
	var agent	= navigator.userAgent;
	var offset	= agent.indexOf( "MSIE" );
	if( offset < 0 )
	{
		return 0;
	}
	return parseFloat( agent.substring( offset + 5, agent.indexOf( ";", offset ) ) );
}

function readOperaVer()
{
	var agent	= navigator.userAgent;
	var offset	= agent.indexOf( "Opera" );
	if( offset < 0 )
	{
		return 0;
	}
	return parseFloat( agent.substring( offset + 6 ) );
}

// Seek nested NN4 layer from string name
function seekLayer(doc, name)
{
    var theObj;
    for (var i = 0; i < doc.layers.length; i++)
    {
        if (doc.layers[i].name == name)
		{
            theObj = doc.layers[i];
            break;
        }

        // dive into nested layers if necessary
        if (doc.layers[i].document.layers.length > 0)
		{
            theObj = seekLayer(document.layers[i].document, name);
        }
    }
    return theObj;
}