//'****************************************************************************
//'                          Comments Section                                 *
//'****************************************************************************
//'Name               Date        Job Code    Details                         *
//'----               ----        --------    -------                         *
//'Paul Davidson      05/08/2009  T-STM125    creation date                   *
//'                                                                           *
//'                                                                           *
//'                                                                           *
//'                                                                           *
//'                                                                           *
//'****************************************************************************

/* Client-side access to querystring name=value pairs
*/
function Querystring(qs) { // optionally pass a querystring to parse
    this.params = {};
	
    if (qs == null) qs = location.search.substring(1, location.search.length);
    if (qs.length == 0) return;

// Turn <plus> back to <space>
    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;
    }
}

Querystring.prototype.get = function(key, default_) {
    var value = this.params[key];
    return (value != null) ? value : default_;
}

Querystring.prototype.contains = function(key) {
    var value = this.params[key];
    return (value != null);
}