[gb2world]

There is a similar tool in Internet Explorer that is not as nice as Firebug - but when you have issues unique to IE - it often helps to use it - it is called IE Developer Toolbar

I took a look at your page - The IE developer toolbar is classifing your search button as not having layout. Strange - but maybe if you assigned specific css size properties - you could regain control. Something like <input type="submit" style="width:200px" value=" Search:"/> ?? You can play around with giving specific css properties and see if it goes away. If it works you could be seeing what is described here.

You may find that you want to have a standard css class for all your submit buttons - you can set the color, size and font - and not be at the mercy of the browsers.