title: Modal Dialog without jQuery
body: <p>I need to create a modal dialog on a webpage using javascript.  Normally this would be easy as I could use something like jQueryUI or BlockUI, but the caveat here is that I'm not permitted to use jQuery, and I need to support IE9 quirks mode (ie no html5 doctype).  I can't find anything online pertaining to what I need.  Would anyone have suggestions?  Thanks.</p>