javascript - prototype Event Observer not working -

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please check doing here false?

 event.observe(form['postalcode'], 'blur', function(form) {return  updatecityname(form) }(form));

i getting javascript error "handle undefined"

give element id of "postalcode", makes lot easier.

   $('postalcode').observe('blur', function(e) {         var element = e.element()                 var myform = element.up('form')         return updatecityname(myform)      });

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