leads upload problem

hello
i m useing astguiclient_1.1.12 and i m facing problem to upload the leads on csv and as well as .xls too .
can any one exlplain me how should i upload hte .csv leads format . when i m trying to upload the sampleleads of .csv it is sowing good =0 bad=0
is there any stander format for .csv .
and what is the stander format for .xls or this version.
i m useing astguiclient_1.1.12 and i m facing problem to upload the leads on csv and as well as .xls too .
can any one exlplain me how should i upload hte .csv leads format . when i m trying to upload the sampleleads of .csv it is sowing good =0 bad=0
is there any stander format for .csv .
and what is the stander format for .xls or this version.