xsl filter problem

Hi,
im building a an XML table which can be filtered according to the
columns.
I have a problem when the filter criteria is in "all" mode (meaning i
dont care which value this column will hold) since the filter dont
except it(even when i assign the * sign to the param directly"
any ideas ?

in my example i use  :

<xsl:for-each select="customers/customer[rooms[$rooms_to>=. and
.>=$rooms_from] and city=$city1]">

and the problem is that in some case the $city param should be * but i
cant make it to be like that.


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