Sending the Search Referrer of an Action to GA

getSearchString.js

 function getSearchString(){
	var ref = top.document.referrer; 
    if (ref.indexOf('?') == -1) return;
    var querys = ref.substr(ref.indexOf('?')+1);
    var qsa = querys.split('&');
    for (var i=0;i<qsa.length;i++) {
	    var qsip = qsa[i].split('=');
		if (qsip.length == 1) continue;
		if (qsip[0] == 'q' || qsip[0] == 'p') { // q= for Google + Bing, p= for Yahoo
		    var wordstring = unescape(qsip[1].replace(/\+/g,' '));
		  //  console.log(wordstring);   -- for debug mode
		  // TrackSearchSignup(wordstring); --production, pushes to Google Analytics
		  return true;
		}
	}
}
	  
function TrackSearchSignup(wordstring){
	_gaq.push(['_trackEvent', 'Signup', 'Register', 'referrer: ' + wordstring]);
	return;
	}
	
	//<a href="blah.com" onClick="getSearchString();">Signup</a>