#59 Use jQuery on instead of javascript onunload

Originally at 2015-02-19T09:50:54Z by Ryan Simmons closed at 2015-02-19T11:23:40Z (pull request) @herby, sorry I found a bug on my previous commit. If you popup Helios, then close it and popup Helios a second time it will not close on the parent unload event. It appears calling onunload: multiple times does not work. I have changed it to rather use jQuery on: do: and can confirm that the bug is no longer present.