I need ScriptManager to work in PHP, that's it.
I'm told using the client side library of ASP.NET AJAX this can be done. Should be very simple if you are good with scripting. Needs to work in all browsers that the client side library of ASP.NET AJAX says it works with.
This Page will run on Linux. Yes, it needs to access a web service on IIS...but if you get scriptmanager to work it doesn't matter where the webservice resides.