var cont = 0;

function addFile(){
	cont++;
	document.getElementById('cont').value = cont;

	var alvo = document.getElementById('ul_file');

	var li = document.createElement('li');

	var inp = document.createElement('input');
	inp.setAttribute('type','file');
	inp.setAttribute('name','file'+ cont);
	inp.setAttribute('id','file'+ cont);
	li.appendChild(inp)

	var link = document.createElement('a');
	link.setAttribute('href','#');
	link.onclick = function(){
		cont--;
		document.getElementById('cont').value = cont;
		li.parentNode.removeChild(li);
		return false;
	}
	link.innerHTML = 'remover';
	li.appendChild(link);

	alvo.appendChild(li);
	return false;
}

window.onload = function(){
	document.getElementById('add_file').onclick = addFile;
}