[jQuery] howto: using autocomplete and validate (with remote) together

[hobbesdev]

hi,
i have in input element where the user can enter multiple email 
addresses (like in thunderbirds to: field)
i use autocomplete to make suggestions form the database when the user 
enters new adresses.
then i want to validate the emailadresses before sending the email, 
because the user can add email addresses by 1.) lookup or 2 manual editing
so i used validate with

var validator = $j("#werkeForm").validate({
           rules: {
               empfaenger:{
                   required: true,
                   minlength:2,
                   remote: "ajaxserver2.php?cmd=chkEmail"
                   },
   ....
  
now the problem seems to be a kind of race condition, cause both methods 
try to operate on the input field.

firebug shows me that each method takes only a few milliseconds, but 
combined they take up to 3 secondes after every keystroke.

is there any advice on how to combine these both plugins?

best regards
stefan