function showClientnumber(abo) {


    if(abo == "B") {
        document.getElementById("clientnumber_wrapper").style.display = 'block';
    } else {
        document.getElementById("clientnumber_wrapper").style.display = 'none';
    }

    /*if(abo == "B") {
        document.getElementById("clientnumber_wrapper").setStyle({display : 'block'});
    } else {
        document.getElementById("clientnumber_wrapper").setStyle({display : 'none'});
    }*/
}