/****************************************************
     Author: Brian J Clifton
     Url: http://www.advanced-web-metrics.com
     This script is free to use as long as this info is left in
     
     DESCRIPTION: Script for tracking the number of search results clicked on per visitor's
	search i.e. visitors conducts search, clicks on 3 results. User Defined varaible (setVar) = 3.
	Visitors then conducts another search, clicks on no results. setVar is reset (0) for new 
	search and not incremented as no search results are clicked on.

	setVar expires after 1 hour - can be adjusted.
          
     All scripts presented have been tested and validated by the author and are believed to be correct
     as of the date of publication or posting. The Google Analytics software on which they depend is 
     subject to change, however; and therefore no warranty is expressed or implied that they will
     work as described in the future. Always check the most current Google Analytics documentation.

****************************************************/
// Last updated Aug-2009. 

var result = 0;
function readCookie() {
// read cookie info
	var myCookie = " " + document.cookie + ";";
	var searchName = " __searchCount=";
	var cookieVal = 0;
	var startOfCookie = myCookie.indexOf(searchName)
	var endOfCookie;

	if (startOfCookie != -1) {
		startOfCookie += searchName.length; 				// skip past cookie name
		endOfCookie = myCookie.indexOf(";", startOfCookie);	
		cookieVal = parseInt(unescape(myCookie.substring(startOfCookie,endOfCookie)));
		if (!isNaN(cookieVal)) {
		    result += cookieVal;
		}
        }
	return result;
}

function Set_searchCount() {
// read cookie __searchCount and increment for each search clickthrough
	readCookie()
	if(result == ""){result = 1}else{result++;}
	document.cookie = "__searchCount="+escape(result)+";path=/";
}

function Clear_searchCount(){
// reset if visitor conducts new search
	var ThreeDays = 3 * 24 * 60 * 60 * 1000;
	var expDate = new Date();
	expDate.setTime (expDate.getTime() - ThreeDays);
	document.cookie = "__searchCount=0; path=/";
}

function _uDomain() {
// returns hash of domain
	var d=document.domain;
	if (d.substring(0,4)=="www.") {
		d=d.substring(4,d.length);
	}
	d=d.toLowerCase(); 
	return _uHash(d);
}

function _uHash(d) {
// hash function
	if (!d || d=="") return 1;
	var h=0,g=0;
	for (var i=d.length-1;i>=0;i--) {
		var c=parseInt(d.charCodeAt(i));
		h=((h << 6) & 0xfffffff) + c + (c << 14);
		if ((g=h & 0xfe00000)!=0) h=(h ^ (g >> 21));
	}
	return h;
}

function Set_utmSetVar(){
// read __searchCount and write back to utmv cookie with expiry of 1 hour
	readCookie()
	pageTracker._setVar(result);
	date = new Date();
	date.setTime(date.getTime() + 1*60*60*1000);
	document.cookie = "__utmv="+_uDomain()+"."+escape(result)+";path=/; expires="+date.toGMTString()+";"
}