Upload not start!

<script language="javascript" src="iuembed.js"></script>
<script language="javascript">
var iu = new ImageUploaderWriter("ImageUploader", 730, 550);

// If you do not want to use ActiveX or Java version, set the appropriate
// property to false.
iu.activeXControlEnabled = true;
iu.javaAppletEnabled = true;

iu.activeXControlCodeBase = "ImageUploader4.cab";
iu.javaAppletCodeBase="./";

// ... initialize params as described in the next topic ...

//DISPLAY PANEL 2 COLONNE

//DESTINATION UPLOAD FOLDER
iu.addParam("UploadSourceFile", "true");
iu.addParam("Action", "upload.php");


//QUALITA IMMAGINE
iu.addParam("QualityMeterFormats", "4 x 6,1800,1200,1.5;5 x 7,2100,1500,1.5;" + "8 x 10,3000,2400,1.5;16 x 20,4000,3200,2;30 x 20,6000,4000,2");

//DATI EXIF
iu.addParam("ExtractExif", "ExifDateTime;ExifOrientation;ExifModel");
iu.addParam("UploadThumbnail1FitMode", "Fit");
iu.addParam("UploadThumbnail1Width", "1024");
iu.addParam("UploadThumbnail1Height", "1024");
iu.addParam("UploadThumbnail1JpegQuality", "70");
iu.addParam("UploadThumbnail1CopyExif", "true");

// As soon as you call this method, all necessary HTML code is inserted
// into the page on the current position. Alternatively, you can 
// get the string with appropriate HTML code using the getHtml method,
// and write it to the necessary position manually (maybe with some modifications).  
iu.writeHtml();
</script>

so now i create a new file named upload.php that contain:

<?php
//This variable specifies relative path to the folder, where the gallery with uploaded files is located.
//Do not forget about the slash in the end of the folder name.
$galleryPath = "../Gallery/";

$absGalleryPath = realpath($galleryPath) . "/";
$absThumbnailsPath = realpath($galleryPath . "Thumbnails/") . "/";

function saveUploadedFiles()
{
	global $absGalleryPath, $absThumbnailsPath;
	
	//First of all, clear files and data uploaded at previous time.
	
	//Delete source files.
	$handle = opendir($absGalleryPath);

	while (false !== ($file = readdir($handle)))
	{
		if (is_file($absGalleryPath . $file))
		{
			unlink($absGalleryPath . $file);
		}
	}
	closedir($handle); 

	//Delete thumbnails
	$handle = opendir($absThumbnailsPath);	
	while (false !== ($file = readdir($handle))) 
	{
		if (is_file($absThumbnailsPath . $file))
		{
			unlink($absThumbnailsPath . $file);
		}
	}
	closedir($handle);

	//NOTE: If you do not want to delete previously uploaded files, just 
	//remove or comment out the code above.
	
	//Create XML file which will keep information about files (image dimensions, description, etc). 
	//XML is used solely for brevity. In real-life application most likely you will use database instead.
	$descriptions = new DOMDocument('1.0');
	$descriptions->appendChild($descriptions->createElement("files"));
	
	//Get total number of uploaded files (all files are uploaded in a single package).
	$fileCount = $_POST ["FileCount"];
	
	//Get author name from attached HTML form.
	$author = $_POST ["Author"];
	
	//Iterate through uploaded data and save the original file, thumbnail, and description.
	for ($i = 1; $i <= $fileCount; $i++)
	{
		//Get the first thumbnail (watermarked image) and save it to disk.
		$thumbnail1Field = "Thumbnail1_" . $i;
		if (!$_FILES[$thumbnail1Field]['size'])
		{
			return;	
		}
		$fileName = getSafeFileName(basename($_POST["FileName_" . $i]));		
		copy($_FILES[$thumbnail1Field]['tmp_name'], $absGalleryPath . "/" . $fileName);

		//Get the second thumbnail (small thumbnail) and save it to disk.
		$thumbnail2Field = "Thumbnail2_" . $i;
		if (!$_FILES[$thumbnail2Field]['size'])
		{
			return;	
		}
		copy($_FILES[$thumbnail2Field]['tmp_name'], $absGalleryPath . "/Thumbnails/" . $fileName . ".jpg");

		//Save file info.
		$xmlFile = $descriptions->createElement("file");
		$xmlFile->setAttribute("name", $fileName);
		$xmlFile->setAttribute("width", $_POST ['Width_' . $i]);
		$xmlFile->setAttribute("height", $_POST ['Height_' . $i]);
		$xmlFile->setAttribute("author", $author);
		$descriptions->documentElement->appendChild($xmlFile);
	}

	$descriptions->save($absGalleryPath . "Descriptions.xml");
}

//This method verifies whether file with such name already exists 
//and if so, construct safe filename name (to avoid collision).	
function getSafeFileName($fileName)
{
	global $absGalleryPath;
	
	$newFileName = $fileName;
	$j = 1;
	while (file_exists($absGalleryPath . "/" . $newFileName))
	{
		$newFileName = $j . "_" . $fileName;
		$j = $j + 1;
	}
	return $newFileName;	
}

saveUploadedFiles();
?>