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blockUI provides a mechanism for blocking user interaction with a page (or parts of a page). This can be an effective way to simulate synchronous behavior during ajax operations without locking the browser.  It will prevent user operations for the current page while it is active ane will return the page to normal when it is deactivate.  blockUI accepts the following two optional arguments: message (String|Element|jQuery): The message to be displayed while the UI is blocked. The message argument can be a plain text string like "Processing...", an HTML string like "<h1><img src="busy.gif" /> Please wait...</h1>", a DOM element, or a jQuery object. The default message is "<h1>Please wait...</h1>"