function $(o)
{
	return document.getElementById(o);
}

String.prototype.getQueryString = function(name) 
  { 
  var reg = new RegExp("(^|&|\\?)"+ name +"=([^&]*)(&|$)"), r; 
  if (r=this.match(reg)) return unescape(r[2]); return null; 
  }