// This is function get querystring 
    function getQuerystring(key, default_)
	{
	  if (default_==null) default_=""; 
	  key = key.replace(/[\[]%20/,"\\\[").replace(/[\]]/,"\\\] ");
	  var regex = new RegExp("[\\?&]"+key+"=([^&#]*)");
	  var qs = regex.exec(window.location.href);
	  if(qs == null)
		return default_;
	  else
		return qs[1];
	}