Page renders IE6, IE8 but not IE7?

I have constructed this pag开发者_JAVA百科e: http://www.letstalkmarketing.co.uk/print

It works fine in IE6 and IE8 but doesn't seem to render anything below the red help and advice block in IE7.

I cannot see what is wrong and frankly without Firebug (Firebug Lite just doesn't really cut it) I am struggling to figure it out.

Thank you for any help you can offer.

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IE7 and position:relative never were very happy bedfellows. Where you have

.info_boxes {
    position: relative;
    top: -20px;
}

You would probably do better with

.info_boxes {
    position: static;
    margin-top: -20px;
}

Alternatively, you could add a width. e.g.

.info_boxes {
    width: 630px;
}

You can map this into a ie7 only stylesheet in a similar way as you've already done with iframe_ie6.css, but specifying the IE version in the conditional comment.