search for: whichscript

I have a little image gallery application in rails enough for small galleries (20< photos). But as images increase and the user needs to scroll down the page it starts getting anoying to see all pictures... I thought pagination but then I saw this AJAX goodness http://www.apple.com/getamac/ads/ As you can see the videos scroll right/left when the arrows are pressed in a circular manner

Didn''t know what else to call this subject, sorry. Anyway this is more a general discovery question then a coding one. Is it possible (and I already know it should be) to create forms where depending on a particular choice in one select tag, one or another select tags would be presented in the form. As an example, a shopping site , where a dropdown has options of: 1-Men''s shoes