function getQuerystring(key, default_)
{
  if (default_==null) default_=""; 
  key = key.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
  var regex = new RegExp("[\\?&]"+key+"=([^&#]*)");
  var qs = regex.exec(window.location.href);
  if(qs == null)
    return default_;
  else
    return qs[1];
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return "";
}

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

if (readCookie("PID") == "") {

	
	var date = new Date();
	date.setTime(date.getTime()+(1*60*60*1000));
	var expires = "; expires="+date.toGMTString();
	document.cookie = "PID="+escape(getQuerystring("PID"))+expires+"; path=/";
	
} else {
	
	if (getQuerystring("PID") == "") {	
		
	} else {	
		
		if (readCookie("PID") != escape(getQuerystring("PID"))) {	
			deleteCookie("PID");
			var date = new Date();
			date.setTime(date.getTime()+(1*60*60*1000));
			var expires = "; expires="+date.toGMTString();
			document.cookie = "PID="+escape(getQuerystring("PID"))+expires+"; path=/";	
		}
		
	}

}