My day...

[d000hg]

In that case, consider my sarcasm retracted

[NickFitz]

Indeed. I did tell 'em up front I don't do design stuff. No worries, they said, they'll supply the designs. I was confidently expecting HTML but got a PDF. Ah well, they seem happy enough with my botch job. Mind you, they haven't looked at it in IE6 yet...!

zoom: 1; is your friend

Install the IE Developer Toolbar. Using its DOM/CSS views, identify containing elements that are leaking their contents (or possibly throwing them to the four corners of the screen) and see if, in the CSS column, they show a property called hasLayout with the value -1. If they don't then, using the attributes inspector, set zoom to 1 and they'll almost certainly start behaving again.

Once you've identified all the elements that need it, just add that zoom into the appropriate CSS declarations: it won't affect anything else, although if you want you can go to town and put it in an IE-only stylesheet included via conditional comments.

Oh, if you have anything floated that has left or right margins, also set display to inline:

#foo {
    float: left;
    margin: 3px 6px;
    display: inline;
}

as that fixes the doubled-margins bug.

[mudskipper]

Thanks Nick - that looks really useful. I love the ff developer toolbar - didn't know IE had such a thing! Help much appreciated.