Adding Form

I have an ASP page with a table that fills with records from a loop. Every
row gets a link to another ASP page with data from the row. The link is
written as <a href=newpage.asp?value1=xx&value2=yy .... and so on.
Now I try to let the user specify a number that should be sent to the other
page. But I do not want to clutter up every row with each an input field,
so I thought instead I would place it above all the data rows. When the user
clicks on the link, I want to include the input field to the querysting. The
problem here is that I cannot figure out how to refer to the name of the
input field.