[jQuery] Keep the focus on field with validation error

[jimmyn...@gmail.com]

Hi folks!!
I'm working with ajax validation in a sign in form. My validation is
perfect, but I need to back focus to previous field, if validation
against previous field return false.

I'd tried something like this:

$("#myInput").blur(function(){
     // All validation code
     if(!valid){
         $(this).focus();
     }
})

But not working...
Some ideas??