Why doesn't this upload script work?

Here's my code:

		if(isset($_FILES['doc_1'])&&!empty($_FILES['doc_1']['name']))
		{
		$pathinfo = pathinfo($_FILES['doc_1']['name']);
		//$new_name = $pathinfo['filename'].'_'.$novie_id.'.'.$pathinfo['extension'];
		$target = "../docs/"; 
		$target = $target . basename( $_FILES['doc_1']['name']);
		echo $target;
		$uploadOk=1; 
		$extension = $pathinfo['extension'];
			if($extension=="jpg" OR $extension=="jpeg" OR $extension=="JPG" OR $extension=="GIF" OR  $extension=="gif" OR $extension=="PNG" OR $extension=="png" OR $extension=="doc" or 
			$extension=="docx" or $extension=="pdf" OR $extension=="xls" OR $extension=="xlsx" OR $extension=="ppt" OR $extension=="pptx" OR $extension=="txt" OR $extension=="pub" OR $extension=="wps"
			or $extension=="bmp" OR $extension=="BMP")
			{
				$uploadOk = 1;
			} 
			else 
			{
				$uploadOk = 0;
				//header("Location:doc_badfile.php");
				//exit();
			}
			
		$upload_dir = "../docs/";
		if (file_exists($upload_dir) && is_writable($upload_dir)) {
		echo "you're good to go";
		}
		else {
			echo 'Upload directory is not writable, or does not exist.';
		}
			
			if(!move_uploaded_file($_FILES['doc_1']['name'], $target))  
			{
			header("Location:doc_noupload.php");
			exit();
			}
			echo "OK";
			
		}
	
	}

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When I comment out the "header("Location:doc_no_upload.php)" dynamic so I can see the target and read all of the other indicators I've been fooling with, there shouldn't be anything keeping this file from uploading.

I've been looking at this for an hour and half. I've got other scripts that follow the same format - no problem. But this one hates me for some reason and I can't figure out what's wrong.

File permissions on target directory are set to 777 so that's good.

Where am I blowing it?