var files = $('.form-videos :input[type=file]').get(0).files;
for (i = 0; i < files.length; i++)
 {
    if (files[i].size > 20971520)
        //do your stuff here
 } 

function CheckFileSize()
{
	var fSize = document.getElementById('fileuploadControl').files[0];
	if (typeof file_obj != 'undefined')
	 {
		if (fSize.size > 2000000)
		{ 
			alert('file size is greater than 2Mb');
			return false;
		}
	}
 
	return true;
}