AJAX Support for IE6 and IE7 through ActiveX

Added AJAX support through ActiveX for IE6 and IE7 so rem should now works for these browsers

AJAX was not working with the actual script in IE6 and IE7 because they rely on ActiveX. I've modified some lines of your code. Mostly, I added some lines where we use getXMLHttpRequest and also, using "new function()" syntax was needed to make it works well. You can do a diff between your code and mine to see where I edited your code.