...
<xsl:param name="param" />
...
<a href ="javascript:jsFunction('{$param}')">Call to javascript</a>

<xsl:template match="tag">
   <a href ="javascript:jsFunction('{.}')">Call to javascript</a>
</xsl:template>

I'm trying create a hyperlink to a javascript function that passes a
parameter that is stored in the xml. I'm lost on how to accomplish this:

what the html should look like:
<a href ="javascript:void(0)" onclick="jsFunction('parameter')">
Call to javascript</a>