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incidentally, i forgot to mention, at home i use a 17" monitor @ 1024x768 resolution. changing to 800x600 resolution didn't produce this problem.
@work the computer i was using had only a 14" monitor and set at 800x768 produced the problem u are speaking of, with a 15" monitor the problem disappeared..
i don't know if this bares any relevance.. but i definitely really wouldn't want to design my site to suit users with 14" monitors as it would create a hell of a lot more work and would limit you as to how u design ur site, it's a matter of weighing up the pro's and cons, & personally i optimize my sites for 1024x768 displays as that seems to be the main screen size for the majority these days..
even if ur on a budget a 17" monitor is well worth the added expense, and not just for viewable area, but the refresh rates are higher.. mine runs 1024x768 @ 85hz and believe me when ur looking at a monitor all day, u want as fast a refresh (higher) rate as possible to reduce flicker and in turn cause less strain on your eyes..
in the uk u can pick up 17" monitors for as little as £60 if u shop around.. a 2nd hand 1 should set u back around £30 - £40. i know really u probably thinking y should i buy a bigger monitor, i shouldn't have to, but it's like all technology really,sometimes the way things move means you need to keep up somewhere along the lines.