Changing a xsl:param value from java script

hi

i have the following xsl:param statement just below the xsl:stylesheet statement in my xsl file

<xsl:param name="S" select="1"/> 

I have a java script function where i try to increment this param by 20.  the java script is as shown below

var			=  document.SLDocument.selectSingleNode("//xsl:param[@name='S']/@select");
var.value = var.value+10;

the value of the xsl param does not change.it remains 1.

what is worng with the above?

thnx in advance for any help!!!!

regards
raj


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