Javascript Error in IE7- IE8 conflict or no with JqueryUI Sortable method.
When drag and drop Tabs appears the error in Pie.htc
Stuff.zip working example of error;

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)
Timestamp: Mon, 26 Sep 2011 10:27:32 UTC
Message: 'null' is null or not an object
Line: 3927
Char: 9
Code: 0
URI: /Scripts/PIE_uncompressed.htc

function removeClass( el, className ) {
var re = classNameRegExes[ className ] ||
( classNameRegExes[ className ] = new RegExp( '\\b' + className + '\\b', 'g' ) );
el.className = el.className.replace( re, '' );
}

+1, error found at http://www.kbrbeheer.nl/nl/klantenservi ... uters.html

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB7.2)
Timestamp: Tue, 3 Jan 2012 14:36:15 UTC


Message: 'null' is null or not an object
Line: 38
Char: 387
Code: 0
URI: http://www.kbrbeheer.nl/js/PIE-1.0beta5/PIEv2.min.htc