Made some changes for IE8, what do you think?

I was working on a site a month ago, and was getting a few IE8 issues.  I noticed you may have already resolved these -- went ahead and added them to my fork anyway in case you find the useful.

Adding ms-filter to make background pgzoomview work better.

Changed .pgzoomspacer to display: inline-block

Using .pgzoomspacer as a div instead of image now, I feel it is a slightly cleaner method and also corrects a white line that was appearing intermittently