HTACCESS allows you to control the data uploaded limit or download limit from your website. For this you just need to write the following lines to your .htaccess file:
php_value upload_max_filesize 20M
php_value post_max_size 20M
php_value max_execution_time 200
php_value max_input_time 200
**M stands for MB
The above lines set maximum upload size, maximum size of data being posted, maximum execution time