Mozilla Bug 410052

this is a caption for this table

col1	col2	col3
1	2	3
4	5
6	7

this is a caption for this bc table

col1	col2	col3
1	2	3
4	5
	6	7

test empty row groups

col1	col2	col3
1	2	3
4	5
	6	7

empty rowgroup + empty rows

col1	col2	col3
1	2	3
4	5
6	7
8	9	10

test cellmap holes

col1	col2	col3
1	2	3
4		5
6
7