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I've seen this, it took a while to figure out, in my case a designer used floats for layout, and his right column is knocked down to under the content in my firefox, not in his [we used different skins], that's because he had assumed 100% width and not taken into account pixel rounding, or a border, or something. This issue in general can be avoided if there is an overall container with width 100%, and subcontainers with widths set relative to the overall container.