When I try use this demo http://interface.eyecon.ro/demos/scrollbar.html with the latest version of jQuery (1.2.6 actually 1.2.* too) I have an error in ie6 and ie7:

"Object dose not support this attribute or method"

I've discovered this and have found problem in idrag.js file (on in Interface 1.2 plugin) which have jQuery.find call on line 502:

var dhe = o.handle ? jQuery(this).find(o.handle) : jQuery(this);

And the error place is in jquery.js, function find(selector) which do this:

return this.pushStack( /[^+>] [^+>]/.test( selector ) || selector.indexOf("..") > -1 ?
			jQuery.unique( elems ) :
			elems );

so selector.indexOf("..") - is not a method of selector if selector is jQuery Object.

As I understand there should be done changes even in jquery.js and should be added checking wether selector is jQuery Object or no and do selector.get() - if it is possible, or such changes shuld be done in idrag.js.