[jQuery] help with ajax post

[nananannae2]

can someone help me get this to work please?  i need a post to a page
that returns a string to set but it's my first time using it

 $("#hash").val(
               $.ajax({type: "POST"
               ,url: "GetNewHash.aspx"
               ,data:"orderid="+ $("#orderid").val()+"&amount="+ $
("#amount").val()+"&dtnow="+ $("#time").val()
+"&Gateway_MerchantConfigID="+ $("#Gateway_MerchantConfigID").val()"
               ,async: false}).responseText);