A: 

What happens there is that you said width='99%' which is subject to some rounding I believe and IE8 comes up with 1 extra pixel. You used a different technique for the div below, in order to obtain the white margin - a padding. On the social media div you used white borders with a width of 5px. IE counts the border width into the overall container width so if you'd say width=100% it would have been 10 pixels wider so I guess you chose 99% to make it closest to a right width.

I suggest you either use the same technique as in the "innerpad" div (paddings) or use an absolute width of 950px rather than a relative one.

CyberDude  2010-09-11 23:47:06
Thank you so much for taking the time to respond. My aptitude resides in design, but I am trying to learn CSS so as not to be a sloppy coder.So yes adding a 100% width made the <Div> look wider on the right in FireFox but fine in IE, so it was really frustrating me to no end.However, building off of your recommendation this is the updated CSS:
Allison Bricker  2010-09-14 14:05:39
#socialMedia{ background:#000000 no-repeat right top; border-bottom:5px solid white; border-left:5px solid white; border-right:5px solid white; overflow:hidden; }
Allison Bricker  2010-09-14 14:09:19
I looked at the live site and it looks fine in that area. Is that the case?
CyberDude  2010-09-15 09:10:52

related questions

html form not working with select list in IE8 (IE7 Compatability)
Should I be developing for Internet Explorer 8?
Running IE6, IE7, and IE8 on the same machine
Inspect in IFrame in IE8 Developer Tools?
Fade In/Out and create/hide <DIV> with javascript
Designing web site for Explorer 8
What is the source of /path/(null) requests?
IE8 shows "Internet Explorer cannot display the webpage"
IE & Drop Down Menus triggering the Pop-Up Blocker
Error on IE8 initialisation (ordinal 650 not founded in iertutil.dll)
How do I make Standards mode work as well as quirks mode?
How do you feel about including ie7.js or ie8.js in your page?
How do I reduce the flicker in IE on postback?
What are the most likely causes of Javascript errors in IE8?
Really strange IE 8 Beta 2 behaviour
Does Internet Explorer 8 support HTML 5?
$.getJSON returning cached data in IE8
Internet Explorer 8 and CSS
IE8 loses cookies when opening a new window after a redirect
Will targeting IE8 with conditional comments work?
Internet Explorer 8 and IE 6 side by side
Internet Explorer 8 beta 2 and Standards
Visual Studio 2008 / Web site problem
Is there any difference between the box models of IE8 and Firefox3?
IE8 overflow:auto with max-height