var btn;

// This script is a simplified adaptation from the
// JavaScript Browser Sniffer
// Eric Krok, Andy King, Michel Plungjan
// see http://www.webreference.com/ for more information

var agt=navigator.userAgent.toLowerCase();
var appVer = navigator.appVersion.toLowerCase();
var is_minor = parseFloat(appVer);
var is_major = parseInt(is_minor);
var iePos = appVer.indexOf('msie');
if (iePos !=-1) {
is_minor = parseFloat(appVer.substring(iePos+5,appVer.indexOf(';',iePos)))
is_major = parseInt(is_minor);
}
var is_getElementById = (document.getElementById) ? "true" : "false";
var is_getElementsByTagName = (document.getElementsByTagName) ? "true" : "false";
var is_documentElement = (document.documentElement) ? "true" : "false";
var is_ie = ((iePos!=-1));
var is_ie3 = (is_ie && (is_major < 4));
var is_ie4 = (is_ie && is_major == 4);
var is_ie4up = (is_ie && is_minor >= 4);
var is_ie5 = (is_ie && is_major == 5);
var is_ie5up = (is_ie && is_minor >= 5);
var is_ie5_5 = (is_ie && (agt.indexOf("msie 5.5") !=-1));
var is_ie5_5up =(is_ie && is_minor >= 5.5);
var is_ie6 = (is_ie && is_major == 6);
var is_ie6up = (is_ie && is_minor >= 6);
// -->

function formatKenteken(obj,e){
    var retvalue = false;
    var val = obj.value.toUpperCase();   
    val = val.replace(/-/g,"");
    if (val.length == 6) {
        obj.maxLength = 8;
        if (val.search(/[A-Z]\d$/g) != -1)
            retvalue = val.substr(0, 2) + "-" + val.substr(2, 3) + "-" + val.substr(5, 1);
        else
            retvalue = val.substr(0, 2) + "-" + val.substr(2, 2) + "-" + val.substr(4, 2);

        obj.value = retvalue;
    }
}