<script type="text/javascript">
<!--
num=0;
var files;
function crear(src,name,num) {
  fi = document.getElementById('fiel');
  contenedor = document.createElement('span');
  contenedor.id = 'div'+num;
  fi.appendChild(contenedor); 
  
  var newImage = document.createElement("img"); 
  newImage.src = src;
  newImage.height = 75;
  contenedor.appendChild(newImage);
  
}


function handleFileSelect(evt) {
    document.getElementById('fiel').innerHTML="";
    var num=0;
    files = evt.target.files; // FileList object

    // Loop through the FileList and render image files as thumbnails.
    for (var i = 0, f; f = files[i]; i++) {
                
      // Only process image files.
      if (!f.type.match('image.*')) {
        continue;
      }

      var reader = new FileReader();
      // Closure to capture the file information.
      
      reader.onload = (function(theFile){
          return function(e){
              crear(e.target.result,theFile.name,num);
              num++;
              };
        })(f);

      // Read in the image file as a data URL.
      reader.readAsDataURL(f);
    }
  }

--> 
function loading(){
    document.getElementById('files').addEventListener('change', handleFileSelect, false);
}
</script>

$i=1;
if (!empty($_FILES)) {
	
	$tempFile = $_FILES['Filedata']['tmp_name'];
	$targetPath = $_SERVER['DOCUMENT_ROOT'] . $_GET['folder'] . '/';
	
	$ext = pathinfo($_FILES['Filedata']['name'], PATHINFO_EXTENSION);  //sacar la extension
   
   	$newFileName = $i.'.'.$ext; //guardar nombre en newfilename
	$i++;
	//Cambiar $_FILES['Filedata']['name'] por nombre que se quiera poner
   	$targetFile =  str_replace('//','/',$targetPath) . $newFileName;
	
	// Para que se cree el directorio si no existe
	mkdir(str_replace('//','/',$targetPath), 0755, true);
	
	move_uploaded_file($tempFile,$targetFile);
}
echo "1";
?>

if (!empty($_FILES)) {
	
	$tempFile = $_FILES['Filedata']['tmp_name'];
	$targetPath = $_SERVER['DOCUMENT_ROOT'] . $_GET['folder'] . '/';
	$targetFile =  str_replace('//','/',$targetPath) . $_FILES['Filedata']['name'];
	
	// Para que se cree el directorio si no existe
	mkdir(str_replace('//','/',$targetPath), 0755, true);
	
	move_uploaded_file($tempFile,$targetFile);
}
echo "1";