Uploading php files to server

Question

Hi. I would have thought my hosting provider could have
helped me with this, but they could not. I have three different
sites that i manage that are hosted at Interland. On one of these
sites, when i upload a php file, and then try to bring this page up
in a browser, it returns....
Internal Server Error
The server encountered an internal error or misconfiguration
and was unable to complete your request.
Please contact the server administrator,
[email protected] and inform them of the time the error
occurred, and anything you might have done that may have caused the
error.
More information about this error may be available in the
server error log.
Apache/1.3.26 Server at www.nd-solutions.com Port 80
I have no problem on the other two sites hosted with them. I
tried explaining the problem and asked what may be the difference
with this site and why i cannot successfully upload these files.
They seem to think it's on my end, but i have no idea what i can do
to remedy this problem. I don't see any difference in the way i
have this site set-up, as compared to the way i have the two others
set-up. Any suggestions or ideas on why this could be happening to
me?
This all started when i tried setting up some forms using
formmail.php on this site and i was not able to get it work, and it
works perfectly on one of the other sites that i host with them. I
dread calling them again -- there are such communication issues,
coupled with bad phone connections. Any thoughts on what i might
do, besides switching hosts -- not an option right now?

Answer 1

Thanks a lot.  Here's what I did thus far:
1) Added this upload form to an html snippet
<form enctype="multipart/form-data" action="uploader.php" method="POST">
<input type="hidden" name="MAX_FILE_SIZE" value="100000" />
Choose a file to upload: <input name="uploadedfile" type="file" /><br />
<input type="submit" value="Upload File" />
</form>
Do I need to create a "MAX_FILE SIZE" .php here? What's this called or how do I go about this? php.ini?
2) Now I inserted this <iframe> below in the same snippet
<iframe src="uploader.php" width="x" height="x"></iframe>2)
3) I also created a folder called 'uploads' for this code below to save to it
$target_path = "uploads/";
$target_path = $target_path . basename( $_FILES['uploadedfile']['name']);
What should this file be named?
Should this code be added to that same file too?
$target_path = "uploads/";
$target_path = $target_path . basename( $_FILES['uploadedfile']['name']);
if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {
    echo "The file ".  basename( $_FILES['uploadedfile']['name']).
    " has been uploaded!";
} else{
    echo "There was an error uploading the file, try again!";
4)  Do I need an .htacces file or php.ini?
5) Do all these files go into the site's root directory?