Question about Layers(DIV)

Hi:
I have a document(invoice, letter patent,...), that it will have a different number of details and concepts.
These will be in the body of the document. These documents will have another sections. Depending of the amount
of details, when the document is printed it will have more or less pages. In each page I print different sections
(header, footer, ...). I´m trying to print all the documents using one ASP page. I define different sections, fields,...
for each document, and depending of the position, size, style,... that I define in the DB I print the sections.
What I do until now is to print in ASP a layer with <div> for each detail line. Later in the client(JavaScript),
I can know how many pages it will have the document using offSetHeight. Then I can print all the headers, footers,...
that I need. But in the server I can´t know how many pages it will have a document because it depends of the
number of details.
The problem is that it´s very slow to draw all these layers in the client.
I would need a function that in ASP(in the server) tells me what height it will have a certain layer(DIV) with
these parameters(text, size of the text, width of the layer,...)
Somebody knows how to know it in the server?
Because in the client with JavaScript I know it using offsetHeight but I can´t do it in the client because it´s
very very slow.

Thank you,
JMAN