report and sub reports

Hi
i have a report that contains several sub reports
sub report1
sub report2
sub report3
sub report4
each sub report returns information for an area

i postioned the sub reports in the order the areas occurr
ie
sub report1
sub report2
sub report3
sub report4

problem is when i run the report the sub reports if no data available
for any of the areas
do not show on the report and thethe sub form with data on it appears
half way down the report.
how do i get the sub form containing data to appear at the top of the
report

thanks

kevin
.