Looking for a CSS fix for IE

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CSS

Found this cool little tutorial for styling drop down menus using CSS. You can change everything about the box - border, font, background colour etc including the drop down arrow. Ive made a custom drop down arrow to suit the style of the site. It all works fine in Chrome, Safari and Firefox. On Opera the box style remains but the arrow reverts back to the default. I can live with this.

However are good ole friend Internet Explorer is the problem. It also reverts back to the default arrow but a portion of my custom built arrow is visible underneath the the default arrow.

Anyone any ideas on how I can fix this? Tested version is IE 9

Here's a link code & css: http://tinkerbin.com/mD2vfqLQ[^]

And some screenshots of the different browsers: http://ScrnSht.com/sqrnlh[^]