is it your homework? hehehe
this code might help you...
<form action="upload.php" method="post" enctype="multipart/form-data">
<?php
// check the filesize
if($_FILES['userfile']['size'] > 50000) // ~50kB
{
echo "The file is too big!";
exit;
}
if(is_uploaded_file($_FILES['userfile']['tmp_name']))
{
move_uploaded_file($_FILES['userfile']['tmp_name'],'uploads/'.$_FILES['userfile']['name']);
echo "upload completed!";
}
else
{
echo "<b>ERROR</b>";
}
?>