[jQuery] datePicker is gone when 2nd time loading a form

[jQuery] datePicker is gone when 2nd time loading a form

im loading a form via load, the first time i load it, datepicker is there, if i now a 2nd time try to load the form, there is no date picker...
(im loading it into the same place as before ('#menu'))
the datepicker code is inside the for .html file
<script>
    $('input#von').datePicker({startDate:'01/01/2000'});
    $('input#bis').datePicker({startDate:'01/01/2000'});
</script>
inputs have the same name when i load 2nd time..
any suggestions what to do ?
(maybe sth like closedatePicker() ? )
mfg MG
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