Call a server function from javascript

[d00_ape]

How can I force a postback and call a codebehind funktion from javascript?
I want to do something like this:

aspx-file

<script type="text/javascript">
function OnRowSelecting(sender, args)   
{
    ServerFunc();
}
</script>

Codebehind c# file

private void ServerFunc()
{
    //… 
}

[dannystommen]

http://ajax.schwarz-interactive.de/d...ajaxsample.zip

download the zip. In the zip there's a Word document with tutorial