xsl:eval & value-of , and transform- vs display-time scripts

Am I correct in my understanding that xsl:value-of may not be used to pass 
node values to a function (returning a string) run by xsl:eval?  If not, 
what is the recommended means for doing this?

For me right now, that question is out of curiousity as to be more specific 
to my current need, eval is probably not the correct tool.  What I _really_ 
want to do right now is to run a function defined in the processor-calling 
HTML to insert a string in the displayed HTML, based on the node values 
selected through the MSXML processor.  I am assuming that I will have to 
write code into the output flow to emit the values into span-regions during 
onload, but would appreciate any links to examples of this or a more 
elegant technique from anyone on the list. I will have zero or more of 
these to define, so defining multiple id'd spans and generating the 
corresponding onload code seem kind of daunting to this relative XSL 
newbie.

Many TIA for any assistance.

:Tom


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