jQuery cant work with iFrame src

i have problem that jQuery didnt show up iframe. i have many iframe in my website. when u click link to show up in iframe. but it doesnt show. here my code:

//i load plugin: 
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.js" type="text/javascript"></script>
开发者_Python百科<script type="text/javascript">
function godirect(url, num)
{
    var target = 'iframe_url' + num;

    var source = jQuery(target).attr('src');

    if (source == "about:blank" || source == "")
    {
        jQuery(target).attr('src', url);
    }
    else
    {
        jQuery(target).attr('src', 'about:blank');
    }

}
</script>

PHP & HTML code:

$godirect = 'godirect("'.$GetData['link'].'", "'.$a.'");';

<a href="#" <?php echo $godirect; ?> > TEST LINK </a>

---

Try this code instead, assuming target is the ID of the frame element:

var target = 'iframe_url' + num;
var oFrame = $("#" + target);
var source = oFrame.attr('src');
if (source == "about:blank" || source == "")
{
    oFrame.attr('src', url);
}
else
{
    oFrame.attr('src', 'about:blank');
}

Edit: when initially empty, the src attribute might be null so try this:

if (source == "about:blank" || source == "" || source == null)

---

You should place the godirect call in the href-attribute or the onclick-attribute of the anchor. Currently your output looks like this:

<a href="#" godirect("url", "num");>TEST LINK</a>

and should be:

<a href="javascript:godirect("url", "num");">TEST LINK</a>