Fixed element jumps to left on scrolling when right floated

[jackplug]

There is an offset().left measurement (el_left) but it is not used. Added el_right_float variable - if true, el_left is used to position the fixed element correctly in the horizontal axis.

(Yvo, does this work correctly for you without this amendment?)

[ymschaap]

Thanks for the commits.The problem with getting the 'left' pixel position is that on browser resize it changes with centered layouts. It's best to left/right float the parent div, like: http://directlyrics.com/code/lockfixed/demo-float-right.html.