var number = 1;
function add_file_upload(){
number++; document.getElementById('number').value = number; var table = document.getElementById("files"); var row = table.insertRow(-1); var group = row.insertCell(0); group.id = "file"; var file = row.insertCell(1); file.id = "file"; group.innerHTML = '<input type="text" name="group' + number +'" value="default">'; file.innerHTML = '<input type="file" name="file' + number +'" required >';
}