Sanity checking getting the width of elements

This works fine, but some other code elsewhere is failing for reasons I don't yet understand :-(

Aha! elementname.style.foo only works with inline style definitions, it doesn't work if you've got a separate style sheet definition, see the "foo" element here...

Use window.getComputedStyle(el, null).getPropertyValue("width") instead.

Beware nasty bug (?) in Safari and FF4, if you pass the element id to .getComputedStyle it causes JavaScript to halt without any sort of console error - grrr, how much time did I waste on that...

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