You can basically use any slider you want, although some may need some style adjustments more than others. The two sliders I keep at the top of my list are the LayerSlider (although this is a paid one), and also a plugin called Widgetkit which is a combination of different things, one is a slideshow. You can see this in action on the Preference demo site. However, when you mentioned that the google maps goes away on the contact page, that is odd. Do you have a link to your site? Also, if you still run into problems, I can help out but I might need admin access to see what is happening for you (if so, email me the login info, don’t post it here).