sys is undefined

I am using a peice of javascript which has

ys.WebForms.PageRequestManager.getInstance()

I am getting the following error

Sys us undefined.

I am not sure what to do?
Mr_ShawAsked:
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Tomarse111Commented:
I might be wrong but isn't that part of the .NET framework and won't work in regular Javascript functions.
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Mr_ShawAuthor Commented:
what about ajax
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Tomarse111Commented:
Ajax (Asynchronous JAvaScript and XML) is really only an enhancement in JavaScript that allows Web pages to be more interactive and behave like local applications. So again as this is a .Net feature, unless you are using .Net to interact with your Ajax calls, it cannot be used.
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