Change page…. without change page

Hi guys!
I’d like to do a weird thing on my website and hope it’s possible to do it. I’ll try to explain…

I created a website where everything is on the homepage. The user can navigate scrolling up and down.
Down the page I have my blog, with articles and stuff. If I click on a link (like a tag or a category) I’d want that the website changes page without loading all the page again.
Should just change the blog part…

Is it possible? Does exist a jquery/javascript/dontknowwhat plugin that can do this thing?

Thanks so much!