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public class ListDrillDown : System.Web.UI.UserControl

{

    protected System.Web.UI.WebControls.Label lblDescription;

    protected System.Web.UI.WebControls.Table tblList;

    protected System.Web.UI.HtmlControls.HtmlGenericControl fullcontent;

    protected System.Web.UI.HtmlControls.HtmlGenericControl mincontent;

    protected System.Web.UI.HtmlControls.HtmlGenericControl tableContent;

    public string DescriptionText;

    private void Page_Load(object sender, System.EventArgs e)

    {

        if( tblList.Rows.Count == 0 )

        {

            Visible = false;

            return;

        }

        Visible = true;

        SetupScript();

        lblDescription.Text = string.Format( DescriptionText, tblList.Rows.Count);

        fullcontent.Attributes.Add("onclick", "javascript:ShowContent(false, " + fullcontent.ClientID+", "+mincontent.ClientID+", "+tableContent.ClientID+");");

        mincontent.Attributes.Add("onclick", "javascript:ShowContent(true, " + fullcontent.ClientID +", "+ mincontent.ClientID+", "+tableContent.ClientID+");");

    }

    private void SetupScript()

    {

        if( ! this.Page.IsClientScriptBlockRegistered("ListDrillDown.ascx"))

            Page.RegisterClientScriptBlock("ListDrillDown.ascx", GenerateScript());

    }

    private string GenerateScript()

    {

        StringBuilder sb = new StringBuilder();

        sb.Append("<SCRIPT language='javascript'>");

        sb.Append("function ShowContent( show, fullId, minId, tableContentId )");

        sb.Append("{");

        sb.Append("if( show == true )");

        sb.Append("{");

        sb.Append("fullId.style.display ='block';");

        sb.Append("minId.style.display='none';");

        sb.Append("}");

        sb.Append("else");

        sb.Append("{");

        sb.Append("fullId.style.display='none';");

        sb.Append("minId.style.display='block';");

        sb.Append("}");

        sb.Append("tableContentId.style.display = fullId.style.display;");

        sb.Append("}");

        sb.Append("</SCRIPT>");

        return sb.ToString();

    }

    public void AddLine( string line )

    {

        TableRow tr = new TableRow();

        TableCell tc = new TableCell();

        tc.Text = line;

        tr.Cells.Add( tc);

        tblList.Rows.Add( tr );

    }

}

I've always wished that ASP.NET would allow for a <SCRIPT> attribute directly in the ASCX file that would allow you to register it as a once/page scriptlet on a web user control.  That would certainly beat spewing the script in the page-behind and using the RegisterClientScriptBlock(...) call.