Using window.onload leads to conflicts

[x-yuri]

I particularly have an issue with history.js, overwriting dropfile's event handler.

[x-yuri]

At least call the previous handler. This is how I resolved the problem:

<script src="/js/dropfile.js"></script>
<script>var windowOnLoad1 = window.onload;</script>
<script src="/js/native.history.js"></script>
<script>
    var windowOnLoad2 = window.onload;
    if (windowOnLoad1 && windowOnLoad2 && windowOnLoad1 != windowOnLoad2)
        window.onload = function() {
            windowOnLoad1 && windowOnLoad1.apply(this, arguments);
            windowOnLoad2 && windowOnLoad2.apply(this, arguments);
        };
</script>