I have records where I need to replace one letter with another. Can I modify this highlighting code to do that?

What I need to do is to update my table of database where a column has to replace one letter with another.

WHat I have is the "insert into" statement where I duplicated the table (not shown below).

I need your advice on this.

Code:
<SCRIPT LANGUAGE="VBSCRIPT" RUNAT="SERVER">
Function Highlight(strText, strFind, strBefore, strAfter)
  Dim nPos
  Dim nLen
  Dim nLenAll
  
  nLen = Len(strFind)
  nLenAll = nLen + Len(strBefore) + Len(strAfter) + 1

  Highlight = strText

  If nLen > 0 And Len(Highlight) > 0 Then
    nPos = InStr(1, Highlight, strFind, 1)
    Do While nPos > 0
      Highlight = Left(Highlight, nPos - 1) & _
        strBefore & Mid(Highlight, nPos, nLen) & strAfter &_
         Mid(Highlight, nPos + nLen)

      nPos = InStr(nPos + nLenAll, Highlight, strFind, 1)
    Loop
  End If
End Function
</SCRIPT>
<%
'OPTION EXPLICIT
Dim strText, strFind
strFind=Keyword
strText=RS("new_text_data")
strText= Highlight(strText, strFind,"<font color='red'><b>", "</b></font>")
Response.Write strText
%>