<form action="gallery.php" method="post" enctype="multipart/form-data">

[...]

			<tr>
				<td>1.</td>
				<td><input type="checkbox" name="checkbox1" /></td>
				<td><input type="file" name="file1" class="textbox" /></td>
				<td><select name="cat1" class="textbox">
					<option value="17">Mein erster Urlaub</option>

				</select></td>
				<td><input type="text" name="comment1" style="width:100%;" class="textbox" /></td>
			</tr>
			<tr>
				<td>2.</td>
				<td><input type="checkbox" name="checkbox2" /></td>
				<td><input type="file" name="file2" class="textbox" /></td>
				<td><select name="cat2" class="textbox">

					<option value="17">Mein erster Urlaub</option>
				</select></td>
				<td><input type="text" name="comment2" style="width:100%;" class="textbox" /></td>
			</tr>


[...]



			<tr>
				<td colspan="4" style="text-align:center;"><input type="submit" name="upload" value="Hochladen" class="button" /></td>
			</tr>



[...]


</form>