weird footer space apperas from nowhere... IE7 problems

I've problem with ie7, for some reason, strange extra space appears near the footer.

Could you help me diagnose this issue?

I wasted two days trying to do something...

See it in action here: http://artvard.co开发者_如何学运维m/category.html

Footer is kind of a sticky version.

I suspect this bit of code at the end is causing your issue. I think IE7 thinks there might be some HTML to be rendered there:

<script>
    (function(d, t) {
        var g = d.createElement(t),
    s = d.getElementsByTagName(t)[0];
        g.async = true;
        g.src = 'https://apis.google.com/js/plusone.js';
        s.parentNode.insertBefore(g, s);
     })(document, 'script');
</script>

A nice trick with JavaScript is that you can wrap HTML comments around it and it still functions as JavaScript without affecting your HTML layout. I personally use it to get around xHTML validation, but it may help you here too:

<!--
    <script>
        (function(d, t) {
            var g = d.createElement(t),
        s = d.getElementsByTagName(t)[0];
            g.async = true;
            g.src = 'https://apis.google.com/js/plusone.js';
            s.parentNode.insertBefore(g, s);
         })(document, 'script');
    </script> 
-->

This may not be your answer, but it is worth a shot.