[TYPO3-shop] VAT Number (EU USt. - Identifikationsnummer)

[Richard Jäger]

Hey,
when someone is ordering something from my store, he has to type in for 
example his Street:

<input type="text" name="recs[personinfo][address]" size="30" 
id="billing_address" value="###PERSON_ADDRESS###" />

But now i want to add a input field for the VAT number, cause i saw in 
the backend if i edit an FE user the field "VAT Number (EU USt. - 
Identifikationsnummer)"

<input type="text" 
onchange="typo3form.fieldGet('data[fe_users][78][tt_products_vat]','','',0,'');TBE_EDITOR.fieldChanged('fe_users','78','tt_products_vat','data[fe_users][78][tt_products_vat]');" 
maxlength="15" class="formField1" style="width: 144px;" value="" 
name="data[fe_users][78][tt_products_vat]_hr"/>


But how can i add that in the frontend orderform?


Thanks in advance :D