Popup.js issue in IE9 only

Having trouble with my site and IE9, if i change the compatibility mode to anything other than IE 9开发者_如何学C standard my login popup works however when in IE9 standard which is the default it does not work. I think the best way to look at this is to try it yourself. My Site

I get this error when i debug it:

SCRIPT5009: 'Draggable' is undefined popup.js, line 77 character 9

anyone familiar with popup.js?

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DO you have a different script running another script using jQuery before popup.js?

Try removing the other script if so, and see if this popup.js is adversely affected.