The previous update to this collection of plugins introduced a cache when adding options (i.e. made it much faster if adding a lot of options). However, it was not cleared when remove options (causing possible conflicts). This is now done and an extra parameter has been added to removeOption (of boolean type), that when set to true, will only remove options if it matches any option(s) defined by the first parameter. More details and download from the Select Box Manipulation project page at the jQuery site. A demo is also available.