Thanks for replying.I use firefox and opera on pc i dont even have crome installed.And in mobile I download with UCWEB via GPRS.what exactly happens is suppose that the file size is 1 MB then it will perfectly download 950 Kb or something near it and then it stops.When it resumes automatically it downloads nothing and downloading finished appears.When you check the file then you realize that its actually corrupted because of incomplete download.And then you have to begin from the scratch.Anyway thanks for the reply.