function getexpirydate( nodays){
    var UTCstring;
    Today = new Date();
    nomilli=Date.parse(Today);
    Today.setTime(nomilli+nodays*24*60*60*1000);
    UTCstring = Today.toUTCString();
    return UTCstring;
}

function getcookie(cookiename) {
	var cookiestring=""+document.cookie;
	var index1=cookiestring.indexOf(cookiename);
	    if (index1==-1 || cookiename=="") return "";
	var index2=cookiestring.indexOf(';',index1);
	    if (index2==-1) index2=cookiestring.length;
	return unescape(cookiestring.substring(index1+cookiename.length+1,index2));
}

function setcookie(name,value,duration){
    cookiestring=name+"="+escape(value)+"; expires="+getexpirydate(duration);
    document.cookie=cookiestring;
	/*  if(!getcookie(name)){
		    return false;
	    } else {
	        return true;
	    }
	*/
}

/** append parameters to gather data  */
function add_ch(n,v) {
    //append only if value of param is present.
    if(v) {
       window.dch +="["+n+":"+enc_data(v)+"]";
    }
}

function enc_data(b) {
    if(typeof encodeURIComponent=="function") {
        return encodeURIComponent(b);
    } else {
        return escape(b);
    }
}

/* Get data */
function G() {
    var dt = new Date()
    if(!window.dch) { window.dch = "";}
    if(screen) 
		{ add_ch("h",screen.height); add_ch("w",screen.width); add_ch("cd",screen.colorDepth);
		    // add_ch("c_ah",screen.availHeight); // add_ch("c_aw",screen.availWidth);
	    }
    add_ch("tz", -dt.getTimezoneOffset());
    add_ch("jv", navigator.javaEnabled());
    if (navigator.plugins)      { add_ch("pg",navigator.plugins.length); }
    if (navigator.mimeTypes)    { add_ch("mm",navigator.mimeTypes.length); }
    add_ch('ua', navigator.userAgent);
    tr = hex_md5(dch);
    setcookie('ch', tr, 730);
}


function gsc() {
	    // Initial Cookie Hash, set if not there.
    if(!getcookie("ch")) {
	G(); 
    }
    if (!getcookie('vw')) {
		var tcnt = getcookie("evw");
		    tcnt++;
	        setcookie('evw', tcnt, 1);
        //  document.write(hex_md5("something"+getcookie("vw")));
    }
    
}
window.onload = gsc;