This function may give some clues though:
Code:
// Copyright (c) Microsoft Corporation. All rights reserved.
........
........
........
function r(s, t, u) {
var strMozillaType = t.slice(2);
if (strMozillaType == "mousewheel")strMozillaType = "DOMMouseScroll";
if (strMozillaType != "mouseenter" && strMozillaType != "mouseleave")s.addEventListener(strMozillaType, q, true);
else {
s.addEventListener("mouseover", q, true);
s.addEventListener("mouseout", q, true);
s.addEventListener("mouseover", z, false);
s.addEventListener("mouseout", A, false);
}
s.addEventListener(strMozillaType, u, false);
}
.......
.......
.......
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