There are two versions of Wijmo. Wijmo Open enhances many of the jQueryUI widgets. It's free. Wijmo Complete has really cool advanced widgets. You pay for that version. Wijmo also supports Themeroller and Knockout. The new version of Wijmo comes with MVC scaffolding that includes Wijmo by default.

>Yes, this is what I am also seeing when I use alert function or confirm (I never used prompt, I think - learnt something new). Craig's link is interesting and looks like there are free stuff there which includes dialogs. I may look into this soon myself.