get an element by ID stored in a string
<p>Using Jquery, how can i get an element using an id stored in a string?<br>
for example:<br>
    <code> var str = "#divname";<br>
    alert($(str).position().left); </code><br>
the $(str) doesn't work...<br>
please help,<br>
Thanks in Advance    </p>
