IE8 Standards Mode Working
Added IE 7/8 support

Added support for excanvas + IE7/8.  IE 8 required a adding the canvas
element to to a container that had no "P" tags.  Also IE 8 standards
requires calling initElement again after any non-canvas changes are
made (such as height/width).

Also had to remove jQuery code dependency from prepareCanvas function
to make excanvas happy.

Tested on Chrome, IE 7/8/9.