Running a JS from an Asp:button?

[hpl]

Is that possible? I have tried this:

<asp:button id=btnOpen OnClick="Javascript: openNewWindow();" tabIndex=20 Runat="server" CssClass="knap2" Text="Åbn fil"></asp:button>

where

<script language=javascript>
		function openNewWindow()
        {
			var winName = "";
            var winFeatures = "width=520,height=640,top=0,left=0,status";
            var winURL = "http://localhost/Prisberegning2004/udskrift.aspx"
            var w;
            w = window.open(winURL,winName,winFeatures);
        }
</script>

But it doesnt't work