<script language="javascript" type="text/javascript">
    	function OpenWindow(url)
    	{
    		window.open(url, "FensterName", "width=300,height=400,left=100,top=200");
    	}
    </script>

		Dim url As String = "Products.aspx?ProductID=" & ProductID.ToString
		Dim navUrl As String = "javascript:OpenWindow('{0}')"
		navUrl = String.Format(navUrl, url)
		myLink.NavigateUrl = navUrl