function showCodetype(type) {

    if(type == '')
        return false;

    var divs = new Array('codetype_url', 'codetype_text', 'codetype_phone', 'codetype_sms');
    for(var i=0;i<divs.length;++i) {

        el = document.getElementById(divs[i]);
        if(divs[i] == type)
            el.style.display = 'block';
        else
            el.style.display = 'none';

    }

    return true;

}