Replace $(this).width() by $(this).css('width'

I've replaced the call to 
```javascript
    $(this).width((100 / calculatedCnt) + '%');
```
by 
```javascript
   $(this).css('width',(100 / calculatedCnt) + '%');
```
as I've found jquery setting a greater value to the width of the element. 
I've found this when debugging why columns where bigger than needed and found out that using `css` instead of `width` fixed it.
I ignore the real cause of this, maybe a jQuery bug with `width`?