jQuery run function only if input fields are empty
<p>I have a survey of which I want to record a user starting to complete it, by capturing the very first change in any input field or textarea.</p>

<p>So, if all fields (<strong>except hidden fields</strong>) are blank and any input / textarea change() is detected, I want to run the function rec_start.</p>

<blockquote>
  <p>if( allBlank ) {   rec_start(); }</p>
</blockquote>

<p>How can I detect allBlank? I asked this question <a href="http://stackoverflow.com/questions/5599504/jquery-detect-input-fields-are-blank">here</a> but added the hidden fields exception too late ... I'll accept answers in both question once I have a working solution.</p>

<p>Thanks</p>
