XSL Transformations

I'm using XSL and XML to render DB content.  My first attached snippet is the XSL, the 2nd is the CSS values..

I'm using this to render a chat/discussion. It basically gives me what I want like below:

My Name
Date
Comments......

            Your Name
            Date
            Comments......

My Name
Date
Comments......

            Your Name
            Date
            Comments......


etc..

My question is, how do I make "My Name" and "Your Name" fields render in bold?

Thanks

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> 
	<xsl:template match="item"> 
		<div class="discussion">
		<div class="{./discussion_class}">
			 <xsl:value-of select="./team_member_name"/><br/><xsl:value-of select="./comment_date"/><br/>
			<xsl:value-of select="./comment"/>
		</div>
		</div>
	</xsl:template> 
</xsl:stylesheet>

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.discussion{font-size:12px;font-color:#000000;margin:5px;}
.discussion.my_comment{width:85%;color:#687899;margin:5px;float:left;}
.discussion.others_comment{width:85%;color:#DDDDDD;margin:5px;float:right;}

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