This page demonstrates a couple of features of Jmol. First, its capability to display electron density isosurfaces and "clouds". Note that apparently Java does not cache file loads from Jmol, so don't expect instantaneous action here. Second, a simple little slider system. This is derived from another project I worked on; it is set up to register the value when you slide but only act on it when you release the mouse. Not tested on Macs.