PHP Help?

what filus said, it's $_POST not $_post.

Make sure the directory exists relative to the file executed

<form enctype="multipart/form-data" action="upload.php" method="POST">
Please choose a file: <input name="uploaded" type="file" /><br />
<input type="submit" value="Upload" />
<select name="map" size="1">
<option>C/</option>
<option>Computertechniek/</option>
<option>Databases en SQL/</option>
</select>
</form>

thats what I ment by putting select into form, everything outside <form></form> will not be sent to server after submit.
Another thing is, you cant assing name of "$map" for inputs, leave it as it was ( name="map"). Your problem with $_POST['map'] not being assigned lies in smth else. As I said, you need to specify values for your options withing select. To give you an example:

<select name="map" size="1">
<option value="1">C/</option>
<option value="2">Computertechniek/</option>
<option value="3">Databases en SQL/</option>
</select>

will send to server variable "map" with value specified by selected option (so $_POST['map'] will hold a value in option). So, if you wont have attribute value present in options, it wont sent a value, thus variable is defacto not sent at all (if you specify value as value="" it will send empty string and variable will be set!! so, no value attribute = no variable, empty attribute = variable holding emptry string). Full example of your form would look like this:

<form enctype="multipart/form-data" action="upload.php" method="POST">
Please choose a file: <input name="uploaded" type="file" /><br />
<input type="submit" value="Upload" />
<select name="map" size="1">
<option value="C/">C/</option>
<option value="Computertechniek/">Computertechniek/</option>
<option value="Databases en SQL/">Databases en SQL/</option>
</select>
</form>

EDIT: or maybe I can be wrong about selects, I actually didnt test whether option with no value attribute is sending innerHtml as value or not (it seems kinda logical to me that no value does basically nothing, but seeing that attribute value is optional, I am not sure right now), but its always nice to follow good programming practices, it will save a lot of troubles in future.