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Problem in calling Web service through JQuery


plz anybody tell me, how to write JQuery to call web service in dropthinf framework.
i have gridview control in my widget and i want to autoupdate its content without page refresh.
thats why i have written one web service which will return updated data in json format to JQuery.
by using this updated jsonn object i will update my gridview contents.
i am new to JQuery. if anyone had done this before then plz just give some solution to me.
Thanx in advance!!!!