How to make my page non clickable when a form submit process is working?

I wo开发者_如何学JAVAuld like to load an overlay image or something when a long time form submit process is working. So that no one can click, any other links in the page during the process, and at the same time show a loading image over the overlay image...how can i make this work with jquery..

Given the features you're after, check out the blockUI plugin for this, you can find the demos here.