XSL AddParameter

Hi All,
         I was trying to pass a parameter to XSL from
ASP Page using Javascript like the one beolw

XSLProc.addParameter("CITY",Request.Form('CITY'));

I get the following error .
msxml3.dll (0x80070057) The parameter is incorrect .

But if do send a static hard coded value  it works
fine something like below . 

XSLProc.addParameter("CITY","BOSTON");

Also if i try to pass a number it works fine after i
use parseInt function in Javascript like the one below
.

XSLProc.addParameter("EMP_NUM",parseInt(Request.Form('EMP_NUM')));

Is there any other way to add string parameters to XSL
from an asp page other than
addparameter funtion  or is there is fix to this
simple issue .

Thanks !!!!!!!

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