/***************************
/ Browser client detection /
***************************/

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

        // *** BROWSER VERSION ***
        // Note: On IE5, these return 4, so use is.ie5up to detect IE5.
        this.major = parseInt(navigator.appVersion);
        this.minor = parseFloat(navigator.appVersion);

        this.nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
                && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
                && (agt.indexOf('webtv')==-1));
        this.nav2 = (this.nav && (this.major == 2));
        this.nav3 = (this.nav && (this.major == 3));
        this.nav4 = (this.nav && (this.major == 4));
        this.nav4up = (this.nav && (this.major >= 4));
        this.navonly = (this.nav && ((agt.indexOf(";nav") != -1) ||
                (agt.indexOf("; nav") != -1)) ) 
        this.nav5 = (this.nav && (this.major == 5));
        this.nav5up = (this.nav && (this.major >= 5));

        this.ie    = (agt.indexOf("msie") != -1);
        this.ie3   = (this.ie && (this.major < 4));
        this.ie4   = (this.ie && (this.major == 4) && (agt.indexOf("msie 5.0")==-1) );
        this.ie4up = (this.ie && (this.major >= 4));
        this.ie5   = (this.ie && (this.major == 4) && (agt.indexOf("msie 5.0")!=-1) );
        this.ie5up = (this.ie && !this.ie3 && !this.ie4);

        // KNOWN BUG: On AOL4, returns false if IE3 is embedded browser
        // or if this is the first browser window opened.  Thus the
        // properties is.aol, is.aol3, and is.aol4 aren't 100% reliable.
        this.aol   = (agt.indexOf("aol") != -1);
        this.aol3  = (this.aol && this.ie3);
        this.aol4  = (this.aol && this.ie4);

        this.opera = (agt.indexOf("opera") != -1);
        this.webtv = (agt.indexOf("webtv") != -1);

        // *** JAVASCRIPT VERSION CHECK ***
        if (this.nav2 || this.ie3) this.js = 1.0
        else if (this.nav3 || this.opera) this.js = 1.1
        else if ((this.nav4 && (this.minor <= 4.05)) || this.ie4) this.js = 1.2
        else if ((this.nav4 && (this.minor > 4.05)) || this.ie5) this.js = 1.3
        else if (this.nav5) this.js = 1.4
        // NOTE: In the future, update this code when newer versions of JS
        // are released. For now, we try to provide some upward compatibility
        // so that future versions of Nav and IE will show they are at
        // *least* JS 1.x capable. Always check for JS version compatibility
        // with > or >=.
        else if (this.nav && (this.major > 5)) this.js = 1.4
        else if (this.ie && (this.major > 5)) this.js = 1.3
        // HACK: no idea for other browsers; always check for JS version with > or >=
        else this.js = 0.0;

        // *** PLATFORM ***
        this.win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
        // NOTE: On Opera 3.0, the userAgent string includes "Windows 95/NT4" on all
        //        Win32, so you can't distinguish between Win95 and WinNT.
        this.win95 = ((agt.indexOf("win95")!=-1) || (agt.indexOf("windows 95")!=-1));

        // is this a 16 bit compiled version?
        this.win16 = ((agt.indexOf("win16")!=-1) ||
                      (agt.indexOf("16bit")!=-1) || (agt.indexOf("windows 3.1")!=-1) ||
                      (agt.indexOf("windows 16-bit")!=-1) );

        this.win31 = ((agt.indexOf("windows 3.1")!=-1) || (agt.indexOf("win16")!=-1) ||
                      (agt.indexOf("windows 16-bit")!=-1));

        // NOTE: Reliable detection of Win98 may not be possible. It appears that:
        //       - On Nav 4.x and before you'll get plain "Windows" in userAgent.
        //       - On Mercury client, the 32-bit version will return "Win98", but
        //         the 16-bit version running on Win98 will still return "Win95".
        this.win98 = ((agt.indexOf("win98")!=-1) || (agt.indexOf("windows 98")!=-1));
        this.winnt = ((agt.indexOf("winnt")!=-1) || (agt.indexOf("windows nt")!=-1));
        this.win32 = ( this.win95 || this.winnt || this.win98 ||
                ((this.major >= 4) && (navigator.platform == "Win32")) ||
                (agt.indexOf("win32")!=-1) || (agt.indexOf("32bit")!=-1) );

        this.os2   = ((agt.indexOf("os/2")!=-1) ||
                (navigator.appVersion.indexOf("OS/2")!=-1) ||
                (agt.indexOf("ibm-webexplorer")!=-1));

        this.mac    = (agt.indexOf("mac")!=-1);
        this.mac68k = (this.mac && ((agt.indexOf("68k")!=-1) ||
                (agt.indexOf("68000")!=-1)));
        this.macppc = (this.mac && ((agt.indexOf("ppc")!=-1) ||
                (agt.indexOf("powerpc")!=-1)));

        this.sun   = (agt.indexOf("sunos")!=-1);
        this.sun4  = (agt.indexOf("sunos 4")!=-1);
        this.sun5  = (agt.indexOf("sunos 5")!=-1);
        this.suni86= (this.sun && (agt.indexOf("i86")!=-1));
        this.irix  = (agt.indexOf("irix") !=-1);    // SGI
        this.irix5 = (agt.indexOf("irix 5") !=-1);
        this.irix6 = ((agt.indexOf("irix 6") !=-1) || (agt.indexOf("irix6") !=-1));
        this.hpux  = (agt.indexOf("hp-ux")!=-1);
        this.hpux9 = (this.hpux && (agt.indexOf("09.")!=-1));
        this.hpux10= (this.hpux && (agt.indexOf("10.")!=-1));
        this.aix   = (agt.indexOf("aix") !=-1);      // IBM
        this.aix1  = (agt.indexOf("aix 1") !=-1);
        this.aix2  = (agt.indexOf("aix 2") !=-1);
        this.aix3  = (agt.indexOf("aix 3") !=-1);
        this.aix4  = (agt.indexOf("aix 4") !=-1);
        this.linux = (agt.indexOf("inux")!=-1);
        this.sco   = (agt.indexOf("sco")!=-1) || (agt.indexOf("unix_sv")!=-1);
        this.unixware = (agt.indexOf("unix_system_v")!=-1);
        this.mpras    = (agt.indexOf("ncr")!=-1);
        this.reliant  = (agt.indexOf("reliantunix")!=-1);
        this.dec   = ((agt.indexOf("dec")!=-1) || (agt.indexOf("osf1")!=-1) ||
                (agt.indexOf("dec_alpha")!=-1) || (agt.indexOf("alphaserver")!=-1) ||
                (agt.indexOf("ultrix")!=-1) || (agt.indexOf("alphastation")!=-1));
        this.sinix = (agt.indexOf("sinix")!=-1);
        this.freebsd = (agt.indexOf("freebsd")!=-1);
        this.bsd = (agt.indexOf("bsd")!=-1);
        this.unix = ((agt.indexOf("x11")!=-1) || this.sun || this.irix || this.hpux ||
                this.sco ||this.unixware || this.mpras || this.reliant ||
                this.dec || this.sinix || this.aix || this.linux || this.bsd ||
                this.freebsd);

        this.vms   = ((agt.indexOf("vax")!=-1) || (agt.indexOf("openvms")!=-1));
}


/*************************
/ Math utility functions /
*************************/

function f_random (pintMax)
{
        return (Math.floor (pintMax * Math.random () ) );
}


function f_round (pintNum, pintRoundTo)
{
        return (pintRoundTo * (Math.floor ((pintNum + (pintRoundTo / 2)) /
                pintRoundTo)));
}


/***********************************************************************
/ name - name of the cookie
/ value - value of the cookie
/ [path] - path for which the cookie is valid - defaults to caller's
/ [domain] - domain for which the cookie is valid - defaults to caller's
/ [secure] - Boolean value indicating if the cookie transmission
/   requires a secure transmission
/  * an argument defaults when it is assigned null as a placeholder
/  * a null placeholder is not required for trailing omitted arguments
************************************************************************/

function setCookie (name, value, path, domain, secure)
{
        var expireDate = new Date ();
        fixDate (expireDate);
        expireDate.setTime(expireDate.getTime() + 365 * 24 * 60 * 60 * 1000);

        var curCookie = name + "=" + escape (value) +
                "; expires=" + expireDate.toGMTString () +
                ((path) ? "; path=" + path : "") +
                ((domain) ? "; domain=" + domain : "") +
                ((secure) ? "; secure" : "")
        if ((name + "=" + escape (value)).length <= 4000)
        {
//              alert ("setCookie (before): " + document.cookie);
                document.cookie = curCookie;
//              alert ("setCookie (after): " + document.cookie);
        }
        else
        {
                if (confirm ("Cookie exceeds 4KB and will be cut!"))
                        document.cookie = curCookie
        }
}


/***********************************************************************
/ name - name of the cookie
/  * return string containing value of specified cookie or null
/    if cookie does not exist
************************************************************************/

function getCookie(name)
{
        var prefix = name + "=";
        var cookieStartIndex = document.cookie.indexOf (prefix);
        if (cookieStartIndex == -1)
                return null;
        var cookieEndIndex = document.cookie.indexOf (";", cookieStartIndex + 
                prefix.length);
        if (cookieEndIndex == -1)
                cookieEndIndex = document.cookie.length;
        return unescape (document.cookie.substring (cookieStartIndex + prefix.length,
                cookieEndIndex));
}


/***********************************************************************
/ name - name of the cookie
/ [path] - path of the cookie (must be same as path used to create cookie)
/ [domain] - domain of the cookie (must be same as domain used to create)
/  * path and domain default if assigned; null or omitted if no explicit
/  argument proceeds
************************************************************************/

function deleteCookie (name, path, domain)
{
        if (getCookie(name))
        {
                document.cookie = name + "=" +
                        ((path) ? "; path=" + path : "") +
                        ((domain) ? "; domain=" + domain : "") +
                        "; expires=Thu, 01-Jan-70 00:00:01 GMT"
   }
}


/***********************************************************************
/ date - any instance of the Date object
/ * you should hand all instances of the Date object to this function for
/ "repairs".  This function is taken from Chapter 14, "Time and Date in
/ JavaScript", in "Learn Advanced JavaScript Programming"
************************************************************************/

function fixDate (date) {
        var base = new Date (0);
        var skew = base.getTime ();
        if (skew > 0)
                date.setTime (date.getTime() - skew);
}