// This code was written by Tyler Akins and has been placed in the

// public domain.  It would be nice if you left this header intact.

// Base64 code from Tyler Akins -- http://rumkin.com

var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";



function encode64(input) {

    var output = "";

    var chr1, chr2, chr3;

    var enc1, enc2, enc3, enc4;

    var i = 0;



    do {

        chr1 = input.charCodeAt(i++);

        chr2 = input.charCodeAt(i++);

        chr3 = input.charCodeAt(i++);



        enc1 = chr1 >> 2;

        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);

        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);

        enc4 = chr3 & 63;



        if (isNaN(chr2)) {

            enc3 = enc4 = 64;

        } else if (isNaN(chr3)) {

            enc4 = 64;

        }



        output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) +

        keyStr.charAt(enc3) + keyStr.charAt(enc4);

    } while (i < input.length);



    return output;

}



function createCookie(name,value,days) {

    if (days) {

        var date = new Date();

        date.setTime(date.getTime()+(days*24*60*60*1000));

        var expires = "; expires="+date.toGMTString();

    }

    else var expires = "";

    document.cookie = name+"="+value+expires+"; path=/";

}



function readCookie(name) {

    var nameEQ = name + "=";

    var ca = document.cookie.split(';');

    for(var i=0;i < ca.length;i++) {

        var c = ca[i];

        while (c.charAt(0)==' ') c = c.substring(1,c.length);

        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);

    }

    return null;

}



function eraseCookie(name) {

    createCookie(name,"",-1);

}



var jsref  = document.referrer;

var jsaccessid = readCookie('jsaccessid')

if (!jsaccessid) {

    //  if you want to track only for the browser session time, remove expiration - 300

    createCookie('jsaccessid', encode64('1974'), 300);

}



var link = "<img src='http://www.nsainc.net/ct/modules/tracking/bin/track.php?jsreferer=" + encode64(jsref) + "&jsaccessid=" + jsaccessid + "&jsfilename=" + location.pathname + "' align='middle' style='display:none;' alt=''>";

document.write(link);