I was having a weird error with Ext UI for jscript 1.1.1 and I identified that the jquery coders tried to "object detect" integers like this:

... + (e.scrollLeft || b.scrollLeft);

Now.. that's very "smart" but fails every time e.scrollLeft is zero (in IE). Makes the code jump to b.scrollLeft and this ends with "Object expected" error.

I then downloaded 1.1.3.1 and noticed someone tried to fudge the issue by shuffling the code a bit (this is line 1442 from the uncompressed distribution):

// Calculate pageX/Y if missing and clientX/Y available

if ( event.pageX == null && event.clientX != null ) {

var e = document.documentElement, b = document.body;

event.pageX = event.clientX + (e && e.scrollLeft || b.scrollLeft);

event.pageY = event.clientY + (e && e.scrollTop || b.scrollTop);

}

Of course this accomplishes nothing and the issue still stands. Here's my fix (good ol' fashioned "typeof"):

// Calculate pageX/Y if missing and clientX/Y available

if ( event.pageX == null && event.clientX != null ) {

var e = document.documentElement, b = document.body;

if (typeof e.scrollLeft == 'undefined') {

event.pageX = event.clientX + b.scrollLeft;

event.pageY = event.clientY + b.scrollTop;

} else {

event.pageX = event.clientX + e.scrollLeft;

event.pageY = event.clientY + e.scrollTop;

}

}