<form id="uploadform" name="uploadform" method="POST" enctype="multipart/form-data">
      <input id="realupload" name="realupload" type="file" multiple/>
      <input id="uploadsubmit" type="submit" value="upload"/>
</form>

$('#uploadsubmit').click(function(e)
{
    e.preventDefault();

        $.ajax({
            type: "POST",
            url: "upload.php",
            data: function(){
                alert("test");
                var data = new FormData();
                data.append("realupload", jQuery("#realupload").get(0).files[0]);
                return data;
            }
            ,
            processData:false,
            contentType: false,
            cache: false,
            success: function(theData){
                $('#innercontent').html(theData);
            },
            error: function() {
                $('#innercontent').html("ERROR, HELP");
            }
        });

    }
});

<?php
//upload.php
if (isset($_FILES["realupload"]))
{
    echo "SUCCESSFUL UPLOAD " . $_FILES["realupload"]["error"];
}
else{
    echo "FILES NOT SET";
}
?>

Hello,

Just use new jquery library jquery-2.1.1.min.js

from

http://jquery.com/download/

It will definitely solve your problem

Few days before i was stuck with same problem so I gave try for above library it did    worked for me.