<xsl:for-each select="./Tab">
            <xsl:variable name="Name" select="./Name" />
            <xsl:variable name="PageURL">
                            <xsl:variable name="width">
                    <xsl:if test="./iWidth != ''">
                        <xsl:value-of select="./iWidth" />
                    </xsl:if>
                    <xsl:if test="./iWidth = ''">
                        <xsl:value-of select="'110'" />
                    </xsl:if>
            </xsl:variable>                
        </xsl:for-each>

上面是一段xsl文件中的脚本，我想在其中加一个点击事件，该怎么加呢