Setting Two Headers in display Table

Hi,
I want to set 2 headers in display table like one is main header and one is sub header. Example is like following:
MAIN HEADER | MAIN HEADER |
SUB 1 | SUB 2 | SUB 3 | SUB 4 |
Data1 | Data 2 | Data 3| Data 4 |
I have to generate this type of table using <display:table> tag and also i
want this both headers to be fixed and the data to be scrolled in page.The data is to be scrollable both horizontally as well as vertically. The header and subheader would remain fixed when vertical scrolling and would scroll with data incase of horizontal scrolling.
Please help.
Thanks
Pranav.Parmar

Panavar,
I presume <display:table> is http://displaytag.sourceforge.net/10/tagreference.html ... interesting.
1. have you tried <td colspan=2> ???
2. have you tried subtables for the subheadings ???

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