What Jquery and css reference do I need to make my popup window work?

What Jquery and css reference do I need to make my popup window work?

Hi I'm trying to create a popup window. I noticed that many samples have ... script language="JavaScript1.2" src="css_js/jquery-ui-1.8.17.custom.min.js" ... On the page. I don't have access to this reference. Have JQuery 1.5.1.js and JQuery-ui-1.8.11.js. Do I need to upgrade my JQuery. If so how do I get the latest update? I'm using Microsoft al Web Developer 2010 Express and I though I had the latest JQuery by updating through the NuGet Package Manager. What do I need to make my popup window work.