I have to present a prototype of an web app in the following days to one of my clients, the thing is I\'m not so good at CSS and worst of all I\'m almost never happy with the re
Have you tried Axure? It's a tool for rapidly creating wireframes, prototypes and specifications for applications and web sites.
It works in a similar way to Balsamiq, but it allows you to export your wireframes/prototype as HTML, CSS and Javascript.
You can then upload this to a server or run it on your computer as a working example.
You can create forms, links, tabs, rollovers, Javascript effects.