Dissappearing margin in IE7 only

[engadven]

Does anyone have any ideas why my picture margin dissappears in IE7 but no other browsers.
On www.straight2web.net you'll see no gap between the left of the picture and the text. If you resize the window it reappears as it should but then when you refresh the screen or move the mouse over the very top CSS driven menu it drops over the text again.
This only happens in IE7

[engadven]

OK I've solved.
IE7 did not like the position of the picture frame to be specified as relative. This is the default anyway but IE6 needs it or the pictures do not show.
So I put an underscore before
_ position: relative;
So that only IE6 sees it.
Firefox is fine.