Implement changeDiffType()
Implement Alt-Modifier for the Preloadindicator
Removing Title from preloadindicator.

I think its distracting, when we now have  onmouseover-stuff.
Do not predict around compareFrame
Add Ctrl-Key to the Modifiers.
Merge pull request #98 from MaPePeR/Modifier-Keys-on-Preloadindicatorclick

Modifier keys on preloadindicator-click & preload-improvements