Fixes javascript error in MSIE8: Unspecified error (outlineWidth)

When DOCTYPE is html MSIE8 would throw an "Unspecified error". Using a
jQuery object in $.extend instead of DOM object prevents the error.

I generated the minified version using an online Uglify compressor: http://marijnhaverbeke.nl/uglifyjs If you prefer another, I could use another or leave the minified version out.