changing the pages a widget shows up on

i would like some widgets to show up on the front page and then different ones to be seen on another page. Is there any way to tell the widgets what pages they are to be seen on? Is there a plugin that i can upload that does this? I don’t want 2 wordpress sites -one for blog, one for site! I just want one, but i need to beable to do this to make it work.
thanks!