XSLT replaces text in attribute value and text nodes

I have an XML document that I am trying to transform and am replacing the string with some values ​​when that value occurs either in the text of a node or an attribute with a name. My xsl file is below, but the main problem is that when a replacement happens on a post attribute, it actually replaces the entire attribute, not just the value of that attribute, so

<mynode message="hello, replaceThisText"></mynode>

      

        
        
        
      

    

becomes

<mynode>hello, withThisValue</mynode>

      

        
        
        
      

    

Instead

<mynode message="hello, withThisValue"></mynode>

      

        
        
        
      

    

When text appears in a text node like

<mynode>hello, replaceThisText</mynode>

      

        
        
        
      

    

Then it works as expected.

I haven't done the fine work of XSLT, so I'm a bit stuck here. Any help would be greatly appreciated. Thank.

<xsl:template match="text()|@message">
    <xsl:call-template name="string-replace-all">
        <xsl:with-param name="text"><xsl:value-of select="."/></xsl:with-param>
        <xsl:with-param name="replace" select="'replaceThisText'"/>             
        <xsl:with-param name="by" select="'withThisValue'"/>
    </xsl:call-template>
</xsl:template>

<!-- string-replace-all from http://geekswithblogs.net/Erik/archive/2008/04/01/120915.aspx -->
<xsl:template name="string-replace-all">
    <xsl:param name="text" />
    <xsl:param name="replace" />
    <xsl:param name="by" />
    <xsl:choose>
      <xsl:when test="contains($text, $replace)">
        <xsl:value-of select="substring-before($text,$replace)" />
        <xsl:value-of select="$by" />
        <xsl:call-template name="string-replace-all">
          <xsl:with-param name="text"
          select="substring-after($text,$replace)" />
          <xsl:with-param name="replace" select="$replace" />
          <xsl:with-param name="by" select="$by" />
        </xsl:call-template>
      </xsl:when>
      <xsl:otherwise>
        <xsl:value-of select="$text" />
      </xsl:otherwise>
    </xsl:choose>
</xsl:template>