function Querystring(qs) { // optionally pass a querystring to parse
this.params = new Object()
this.get=Querystring_get
if (qs == null)
qs=location.search.substring(1,location.search.length)
if (qs.length == 0) return
qs = qs.replace(/\+/g, ' ')
var args = qs.split('&') // parse out name/value pairs separated via &
for (var i=0;i<args.length;i++) {
var value;
var pair = args[i].split('=')
var name = unescape(pair[0])
if (pair.length == 2)
value = unescape(pair[1])
else
value = name
this.params[name] = value
}
}
function Querystring_get(key, default_) {
if (default_ == null) default_ = null;
var value=this.params[key]
if (value==null) value=default_;
return value
}