function confirmar()
{
	var canvas = document.getElementById("canvas");
	var context = canvas.getContext("2d");
	var img     = canvas.toDataURL("image/png");
	var imagen = document.getElementById("imagen");
	
	imagen.value = img;
	
	//document.write('<img src="'+img+'"/>');
	
	var formulario = document.forms["formulario"];
	formulario.submit();
	
}