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1) Usually, with each theme, there are three css files in the theme folder : for example, style.css, styleMAC.css and styleNN.css. Style relates to Internet Explorer, styleMAC to a Mac browser, and styleNN to Netscape, Firefox (Mozilla browsers).
To get the same settings to apply in all three, you need to make the appropriate change to all three css files.
2) Your disk drive question on your forum...drill holes is good but data is still recoverable. If it were me, I'd wipe them first using a disk wiping utility, then drill holes in them and then soak them in original (sugar rich) Coka Cola for 24 hours - that really will destroy your data!