Uploading file with wp_upload_bits()

Hello I’m trying to upload image file i have input field:

echo '
<form method="POST" action="">
<input type="file" name="file" size="40" />
<input class="button-primary" type="submit" name="Save" value="Send" onClick="'. Send(file_get_contents($_FILES['file']['tmp_name']), $_FILES['file']['name']) .'" id="submitbutton" />
</form>';

and function:

function send($bits, $name){
  $upload = wp_upload_bits($name, null, $bits);
}

And i’m getting error: Filne name not exist
whats the problem?

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