Event Handler To Track Cursor Movement Deep In Code?

This might be more easily explained just by showing you the code. Basically, this is a function within a large class dealing with moving table rows around, and works in Chrome but no where else. Chrome understands "event.clientY" in this context while other browsers throw "event is undefined". Y is a correctly set global indicating the clientY of where the original click occurred.

Code:

set_bgcolor = function (t, r) {
var tr, i;
var currentY = pointer.y = event.clientY;
tr = tables[t].rows[r];

[Code]....

So, I'm just trying to get event.clientY to work for all browsers in this case, where an event handler might not easily be passed to the function.

Details:

I'm using third-party code to move rows of a table around. [URL]

It's a large piece of drag and drop code, but I'm trying to edit it so that at a point near the code's completion, it says whether the initial mouse click was above or below where the cursor has been dragged to. "Why" is a long story, but suffice it to say that there are functional differences when dragging the row up rather than down (up puts it above the hovered over row, while below puts in under that row), and I want to place a border line in there so that users know exactly where the row is going.

So you probably don't have to look at the whole code (which I can provide if you'd like), but my basic question is, how do I get the function to know where the current mouse pointer is this many levels deep in code. I could try to pass the event through all the layers, but I'm not good enough at javascript to make that work, and I'm not sure it would. Isn't the event the keypress (and not the current position?).