setCookie on click as well
setCookie on click as well

It's possible for users to open links in a tab.  In this case the new
tab's onload event will fire, but the unload event for the current tab
doesn't fire (since there's no unload).  We still need to capture the
time the user initiated the action, which is most likely the click
event.

Note that since we use onmouseup to trap click events, this will not
fire on keyboard initiated links.  On MacOSX, you can open links in a
new window using Shift+Enter and new tab using Cmd+Enter (Alt+Enter
downloads).  It's still better than nothing.

lognormal/boomerang,lognormal/boomerang