Substring a Value

I am stuck on a line of code, which creates a link based on a value the xsl 
retrieves from the xml file (@from).  I need to be able to substring the 
@from value (ie. ID(ODP_12345) to ODP_12345) for the link to point to the 
correct file.

The line to be modified:

<xsl:attribute name="href"><xsl:value-of select="@from"/></xsl:attribute>


where, <xsl:value-of select="@from"/> (the value returned) needs to be 
substringed(2, len(@from)-1).

I have tried several JavaScripts, but I can't seem to get anything to work.


The anchor syntax is:

<a>
<xsl:attribute name="href"><xsl:value-of select="@from"/></xsl:attribute>
                       <i>
                                   <xsl:apply-templates/>
                       </i>
</a>



Version:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/TR/WD-xsl";>


Thanks,
Trevor

_________________________________________________________________
Designer Mail isn't just fun to send, it's fun to receive. Use special 
stationery, fonts and colors. 
http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=http://hotmail.com/enca&HL=Market_MSNIS_Taglines 
 Start enjoying all the benefits of MSN® Premium right now and get the 
first two months FREE*.