widget size creator done!

i did it!!! see comments for notes on how i did it. basically, use
.filter() to refrain from putting "highlight" class on any li that was
on a higher row than the <li> i clicked on. then further filter the
<li>s that have the "highlight" class by using "removeClass" from any
<li> in a column further to the right than the <li> i clicked on.