Intellisense in AJAX script ?

HI all the readers

Is there any way to get intellisense when writing AJAX script in javascript?

for example

Sys.WebForms. will list BeginRequestEventArgs, PageRequestManager...etc

or only way is to look up reference or memorize it~

Thanks all

Visual Studio "Orcas" will support this but until then there is no intellisense (with Visual Studio anyways)