更改Javascript中所有对象的游标

I am building an AJAX application that needs to change the cursor to a waiting cursor while waiting for the response to come in, and change back after. I know how to do that bit, but when the cursor is over links, or objects with custom cursors, those don't change, remaining as they were. Does anyone know how can I get the pointer to be the same for all objects temporarily?I am building an AJAX application that needs to