JPEG Images:   Many of these pages contain images of molecules with a white background.  These images generally depict some symmetry element present in that molecule.  Those images that have a colored border are linked to animated .gif files.  Clicking on these images will bring up an animation of the depicted symmetry operation.  You need no special plug-in to view these animations, both Netscape and Explorer support animated gif files.  After viewing the animation, you can return to the previous page by clicking the BACK button on your browser.

Chime Images:   The images of molecules with a black background are Chemscape Chime images.  These are interactive models that require the free Chime plug-in available from MDL.  This plug-in is available for both Netscape and Explorer.  These molecules can be manipulated in a number of ways, a few of which are listed below.

• Rotate - Molecules can be rotated by left-clicking on the molecule and then dragging the mouse.  This will enable you to view the molecule as a 3D object from your choice of perspectives.
• Resize - You can expand or shrink the molecule by holding down the Shift key as you left-click on the image and drag the mouse up or down.
• Rendering - You can change the rendering of the molecule from wire frame, ball & stick, stick or space-filling models by right-clicking on the molecule.  This brings up a menu.  Placing the cursor on the display option brings up a sub-menu with the rendering options.
• Lighting - By right clicking on the molecule and choosing the options item, and then the specular item from the sub-menu, you get a molecule rendered as though a bright light were shining on it.  While this is unnecessary for using the tutorial, the molecules are much prettier this way! :-)