title: how to make a jquery "$.post" request synchronous
body: <p>I’ve been googling this and avoiding this error in my bug fix list for a long time now, but I’ve finally reached the end of the list, the last of which I have to make a function return true/false to state whether the validation has succeeded or not. </p>
  
  <p>I'm using ajax to compare certain fields with those that are already in the db and by default the <code>$.post()</code> method does it's operations asynchronously.</p>
  
  <p>I’m setting a variable inside the call <code>onSuccess</code> and the calling method doesn't get a response because of this, so all my js/jquery fails on pageLoad... I would prefer if I could still keep using the <code>$.post</code> method.</p>