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Modify elements from external script


manix

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Hello,

 

What I have is a simple registration form where in the username field I have a onkeypress event (onkeyup actually) which sends an ajax request to check if the name is already taken, but my problem is that from the external script I can only like display a text below or sth saying it's already taken, what I want to do is paint the field red and I can't figure out how to do it...

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