Unexpected syntax error : "\n" in javascript/jquery
<p>The below code is in my javascript/jquery script, but for some reason Firebug tells me I have a "syntax error: <code>var fbbirthday = ;\n</code>".  </p>

<pre><code>var fbbirthday = &lt;?php echo $fb_day_of_birth; ?&gt;;
var fbbirthmonth = &lt;?php echo $fb_month_of_birth; ?&gt;;
var selectbirthyear = $('#ad_engine_birth_date_year').val();
</code></pre>

<p>Meanwhile, the browser actually shows the following (because the php variables <code>$fb_day_of_birth</code> and <code>$fb_month_of_birth</code> are empty when the user isn't logged into facebook).</p>

<pre><code>var fbbirthday = ;
var fbbirthmonth = ;
var selectbirthyear = $('#ad_engine_birth_date_year').val();
</code></pre>

<p>I've spent a while trying to figure out where the <code>\n</code> that firebug finds is coming from.  Any help would be appreciated!</p>
