Karlo, 

instead of:

>       <A><xsl:attribute name='HREF'>
> mailto:abc@xxxxxxx?subject=order&body=send%20current-issue
>           </xsl:attribute>
>      </A>


use

<a><xsl:attriubte name="href">
<xsl:text disable-output-escaping='true'>
mailto:abc@xxxxxxx?subject=order&amp;body=send%20current-issue
</xsl:text>
</xsl:attriubte>
</a>

The problem is that you were using an & for something other than starting an
entity. This will fix your problem. 

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list