Clicking on button twice its skipping the page.

[krishna567]

In my project I have created wizard using Ext js 4, in wizard there are two buttons previous and next to navigate the page.
but the issue is when i am clicking on next button immediately twice then wizard next page is skipping and its moving to third page.
May be the reason is causes due to delay in server response when first response is going on , but don't know how to handle this one so it would not skip the page and it wont go the second request until response from the first request,