how to add an on keyup function with jquery -

i need add onkeyup function input field cannot edit. field looks this.

  <input id="billing_addr_zipname" type="text" maxlength="50" value="" name="billing_addr_zipname"> 

i need add ...

onkeyup="return addresscountedit(this,'spaneditaddress', event)" 

... id using jquery.

anyone know how that?

basic jquery:

$("#billing_addr_zipname").keyup(function() {     //do stuff });