LavaLamp Menu issue in IE 8 - Vertical & Horizontal guideLines around the Low opacity gray oval

Please see the below link in bo开发者_运维百科th ie8 and firefox.

LavaLamp Plugin - jQuery

orange lavalamp is ok in firefox.

but in ie8 there are some guidelines (Vertical & Horizontal guideLines Around the Low opacity gray oval... like border-right:1px solid orange; and border-bottom:1px solid orange;)

how can I remove these guidelines? because this problem is in ie , so I can not not use firebug (firefox extension to figure out the problem)!

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i figured out this problem occured because of my IE8 In Windows 7 / so i updated it to IE9 and now every thing is ok /

i test it in another IE8 in windows XP and every thing was ok / i did n't figure out what was the problem about IE8 In windows 7!