Need Help Editing an Image Upload Script

I need an image uploader that uploads images without refreshing the page.

I had some trouble finding one that is compatible with Apple as most use Flash or iFrames.

I finally found one here: http://www.webinfopedia.com/upload-image-using-PHP-ajax.html which works really well.

What I'm having trouble with is adding a timestamp to the image to keep the names unique.

Upload Code:

<?php
$uploaddir = './images/'; 
//Create a random digit using time to create unique image name
$random_digit=time();
$file = $uploaddir ."$random_digit".basename($_FILES['uploadfile']['name']); 
$file_name= "$random_digit".$_FILES['uploadfile']['name']; 
 
if (move_uploaded_file($_FILES['uploadfile']['tmp_name'], $file)) { 
  echo "success"; 
  echo "$random_digit";
} else {
	echo "error";
}
?>

PHP:

When I output the image in this code:

<script type="text/javascript" >
	$(function(){
		var btnUpload=$('#me');
		var mestatus=$('#mestatus');
		var files=$('#files');
		new AjaxUpload(btnUpload, {
			action: 'uploadPhoto.php',
			name: 'uploadfile',
			onSubmit: function(file, ext){
				 if (! (ext && /^(jpg|png|jpeg|gif)$/.test(ext))){ 
                    // extension is not allowed 
					mestatus.text('Only JPG, PNG or GIF files are allowed');
					return false;
				}
				mestatus.html('<img src="ajax-loader.gif" height="16" width="16">');
			},
			onComplete: function(file, response){
				//On completion clear the status
				mestatus.text('Photo Uploaded Sucessfully!');
				//On completion clear the status
				files.html('');
				//Add uploaded file to list
				if(response==="success"){
					$('<li></li>').appendTo('#files').html('<img src="images/$randomdigit'+file+'" alt="" height="120" width="130" /><br />').addClass('success');
				} else{
					$('<li></li>').appendTo('#files').text(file).addClass('error');
				}
			}
		});
		
	});
</script>

PHP:

All I am outputting is the image name without the $randomdigit.

Is there any way I can pass the randomdigit variable with the image name? I'm not awfully familiar with JS or Ajax...

Thanks.