Bug on the menu

All browsers.

Enter on the site (calculadoraonline.com.br), choose a item on the menu, see the item actived. You will see a white space bellow of actived item.

strange we don't have such problem on our demo. Try this:

Add this in index.php of template at start of head section:

<!--[if lte IE 7]>
<style type="text/css">
body
{
position:relative;
}

body > *{ z-index:1001;}
body > * > * > * {z-index:1000;}
body > * > * > * > * {z-index:999;}
body > * > * > * > * > * {z-index:998;}
body > * > * > * > * > * > * {z-index:997;}
body > * > * > * > * > * > * > * {z-index:996;}
body > * > * > * > * > * > * > * > * {z-index:995;}
body > * > * > * > * > * > * > * > * > * {z-index:994;}
body > * > * > * > * > * > * > * > * > * > * {z-index:993;}
body > * > * > * > * > * > * > * > * > * > * > * {z-index:992;}
body > * > * > * > * > * > * > * > * > * > * > * > * {z-index:991;}
body > * > * > * > * > * > * > * > * > * > * > * > * > * {z-index:990;}
body > * > * > * > * > * > * > * > * > * > * > * > * > * > * {z-index:989;}
body > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * {z-index:988;}
body > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * {z-index:987;}
body > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * {z-index:986;}
body > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * {z-index:985;}
body > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * {z-index:984;}
body > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > *{z-index:983;}
body > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > *{z-index:982;}
body > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > *{z-index:981;}
body > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > * > *{z-index:980;}
</style>
<![endif]-->