non-reloading header and flash menu

Hello, i am fairly new to php and css and blogging. My question is, is it possible to make my blog so that the header isn’t reloaded everytime you click on a menu item. I would like for it to not reload and only the content that needs to be loaded loaded in the appropriate spot.

I am also wanting to make a flash menu for my blog to link to the various pages. Any suggestions on how to do this.

Thanks for your help.