XSL href with document.form.text.value

I am trying to pass a value of a textbox to an other asp page
I am trying doing this

<a><xsl:attribute 
name="href">javascript:PopUpaNewWindow(document.Mpage.RowsDone[4].Value 
)</xsl:attribute>
the problem that the js function cannot define the textbox value

also I tried this

   		<a href="mypage.asp?Myparam={windows.document.Mpage.RowsDone.Value} 
)">
I got an error

what can I do ?
thanks very much

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