<script src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
<script>
$(function() {
$('#uploadbtn').click(function(e) {
$('#upload').click();
});
});
</script>
<p><input id="uploadbtn" type="button" value="Select Files"/></p>
<input id="upload" type="file" name="loadfile" style="visibility: hidden; opacity: 0; position: absolute;">