<xsl:template match="image">
  <xsl:choose>
  <xsl:when test=".='logo PG'">
  <img src="{@source}" class="left" alt="logo PG"/>
   </xsl:when>
    <xsl:when test=".='logo ETI'">
  <img src="{@source}" class="right" alt="logo ETI"/>
  </xsl:when>
  </xsl:choose>
  </xsl:template>

            <xsl:apply-templates select="course/information/media"/>