function getUrlParam( name )
{
  var regexS = "[\\?&]"+name+"=([^&#]*)";
  var regex = new RegExp( regexS );
  var results = regex.exec( window.location.href );
  if( results == null )
    return "";
  else
    return results[1];
}

function trackCookie(){
	var cookieValue = getUrlParam( 'r' );
	var domainName=document.domain;
	var date = new Date();
	date.setTime(date.getTime() + 3000*3600*24);
        var expiry_date = date.toGMTString();
	if(cookieValue != ""){
	    document.cookie = "ref_id="+cookieValue+"; expires="+expiry_date+"; path=/;domain="+domainName+";"
        }
}

function deleteCookie(){
    var domainName=document.domain;
    var date = new Date();
    date.setTime(date.getTime() -1);
    var expiry_date = date.toGMTString();	
    document.cookie="ref_id=null;expires="+expiry_date+";path=/;domain="+domainName+";"
    }