dojo.declare("com.mgh.QueryString", null, {
	constructor : function (qs){
		this.params = {};
		
		if (qs == null) qs = location.search.substring(1, location.search.length);
		if (qs.length == 0) return;
	
	    // Turn <plus> back to <space>
	    // See: http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.4.1
		qs = qs.replace(/\+/g, ' ');
		var args = qs.split('&'); // parse out name/value pairs separated via &
		
	    // split out each name=value pair
		for (var i = 0; i < args.length; i++) {
			var pair = args[i].split('=');
			var name = decodeURIComponent(pair[0]);
			
			var value = (pair.length==2)
				? decodeURIComponent(pair[1])
				: name;
			
			this.params[name] = value;
		}		
	},
	
	get : function (key, default_) {
		var value = this.params[key];
		return (value != null) ? value : default_;
	}, 
	
	contains : function(key) {
		var value = this.params[key];
		return (value != null);
	}
});