jquery check variable values
<p>In jQuery I have the following 4 variables. </p>

<pre><code>var add
var city
var state
var zip
</code></pre>

<p>I need to check to see that any one of the above have a value. 
If none have a value that is OK. If all of them have a value that is OK.</p>

<p>Just need to check that at least one of them do not have a value.
Not sure what is the most efficient way of doing this. </p>
