Ограничение размера загружаемого файла

Простите за глупый вопрос, но может кто нибудь подскажет, как в компоненте ограничить размер загружаемого файла?

// Get the data from the form POST

                $data = JRequest::getVar('jform', array(), 'post', 'array');

						print_r( $data);		

				if(md5($data['verify'])==$data['hvalue']){

					jimport('joomla.filesystem.file');

						$jFileInput = new JInput($_FILES);

						$theFile = $jFileInput->get('jform',array(),'array');

						$theFileName = JFile::makeSafe($theFile['name'] ['author_image']);

	

						if ($theFileName!=""){

						//Uploading the image file

							if ( strtolower(JFile::getExt($theFileName) ) == 'jpg'||'png') {

							// Build the paths for our file to move to the components 'upload' directory

							$theFileName = JFile::makeSafe($theFile['name'] ['author_image']);

							$newfilename=(rand(1,1000000))."_".$theFileName;

							$tmp_src    = $theFile['tmp_name']['author_image'];

							$tmp_dest   = "images/com_testimonial_pro/uploads/". $newfilename;

							$this->dataFile = $newfilename;



							// Move uploaded file

							$uploaded = JFile::upload($tmp_src, $tmp_dest);

							$data['author_image']=$tmp_dest;