I just figured out how to do it using xsl variable and value of.
<xsl:variable name="ID">
<xsl:value-of select="substring-before(@FileLeafRef, '-')"/>
</xsl:variable>
<a href="javascript: {ddwrt:GenFireServerEvent(concat('__cancel;__delete={',$KeyField,'=',$KeyValue,'};__commit;__redirect={http://myportal.website.com/site/ManageView.aspx?ID=',$ID,'}'))}" onclick="return DeleteItemConfirmation();"><img src="Delete-icon.png" width="10" height="9" border="0"/></a>
Great!