function readQuery(naam) {
		var qsParm = new Array();
		var query = window.location.search.substring(1);
		//alert("query: " + query);
		var parms = query.split('&');
		for (var i=0; i<parms.length; i++) {
			var pos = parms[i].indexOf('=');
			if (pos > 0) {
				var key = parms[i].substring(0,pos);
				var val = parms[i].substring(pos+1);
				qsParm[key] = val;
			}
		}
		if (qsParm[naam]) {
			return qsParm[naam];
		} else {
			return null;
		}
	}