No jala que opinan de esto!!!!
<script type="text/javascript" src="jquery-2.1.4.js"></script>
<script>
{
function uppdf(upload)
{
iframe = document.getElementById("miIframe");
$.ajax({
type: "POST",
url: "save_.php",
data: upload
}).done(function( upload ) {
iframe = document.getElementById("miIframe");
upload.split("/");
iframe.src = upload[upload.length];
iframe.contentWindow.location.reload();
});
}
}
</script>
<div id="izq">
<form enctype="multipart/form-data" name="form1" action="save_.php" method="POST">
<p align="left"><strong>BUSCAR PDF</strong></p>
<p align="left"><input name="uploadedfile" type="file" size="80" maxlength="50" class="b1" onchange="uppdf(this.value)"/></p>
</form> </div>
<div id="der">
<iframe id="miIframe" name="miIframe" src="" width="640" height="750"></iframe>
</div>