Places the columns next to eachother instead of underneath

The 45% + 10% + 45% failed in IE7, making the 2nd column fall
underneath the first. This fixes that by changing the widths to 45% +
45% + [whatever is left].
Adds global state check for old IE (7) and makes clicking options work

Adds option (state) "isOldIE" which is set to true if $.browser is
present and checks positive for ie7.

Also makes clicking options work in ie7 (by replacing the click event
with mouseup event which is the bizar fix).
Revert "Adds global state check for old IE (7) and makes clicking options work"

This reverts commit 563d2e42cf43d7382647695b7eb5a14cb561a53c.
Prevents all options being disabled in IE7

Which made them unselectable. The disabled attribute doesn't seem
necessary on <li>s so it's now prevented.
Merge pull request #91 from Frique/ie7_support

IE7 support