http://www.junchenwu.com/2005/05/post_18.html
table-layout:fixed
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Table and column widths are set either by the sum of the widths on the col objects or, if these are not specified, by the width of the first row of cells. If no width is specified for the table, it renders by default with width=100%.
有关表格的文章：
http://www.usability.com.au/resources/tables.cfm#complex
http://www.456bereastreet.com/archive/200410/bring_on_the_tables/