function clientdata_advert_switch() {
    var previous_status = document.getElementById('advert_switch_field').value;
    if (previous_status == "1") {
        document.getElementById('clientdata_advert_btn').src='/.file/option.gif';
        document.getElementById('advert_switch_field').value = "0";
        clientdata_setreqest('/clientdata/set_clientdata.php?setfieldname=wantspub_field&setfieldvalue=0');       
    
    } else {
        document.getElementById('clientdata_advert_btn').src='/.file/option_o.gif';       
        document.getElementById('advert_switch_field').value = "1";       
        clientdata_setreqest('/clientdata/set_clientdata.php?setfieldname=wantspub_field&setfieldvalue=1');       
    }
}