xsl:output not showing html tags

["asim" <qazi@advcomm.net>]

<xsl:variable name="QHelp"><b>Preblem : </b>this is solution <br/> more text here </xsl:variable>

when is output this variable, I cant see the my text bold and no <br> works.

what is the problem with this , i use <xsl:value-of select="$QHelp"/>

Plz Help

Qazi Asim