Issue with 'upload' widgets & Import on servers which do not allow file upload
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1)	Introduction

If your server does not allow file upload because of some security issue,
then with the default configuration; The Item_Input.php script may not work
properly because the <FORM ...> has a enctype="multipart/form-data" added.

The Import process will also suffer from this problem, and it may not be
obvious that this is the reason.

2)	Workaround - Item_Input (No workaround exists for Import process)

You can bypass this issue by getting rid of the 'upload' input widget for
IMAGEURL.  Change it to 'saveurl(50,*,"gif,jpg,png")' or 'hidden' only.

UPDATE s_attribute_type set input_type = 'hidden' 
WHERE s_attribute_type = 'IMAGEURL';

A change added to 0.39p2 and 0.50-dev5 means that if
no 'upload' widget types (currently 'upload(...) or upload_or_saveurl(...)' 
then the 'enctype="multipart/form-data"' will not be added to the form.

You should also turn off all file upload functionality by setting the
include/config.php variable $CONFIG_VARS['file_upload_enable'] = FALSE;

3)	Notes

	PHP 4.1.2 on Redhat 7.3 (and perhaps other systems) has file uploads
	disabled by default.  If you try to use any of the file upload widgets
	the item_input updates will fail without any visible message, other
	than 'Operation not available'.  You can either enable file uploads
	in your php.ini file, or perform the workaround detailed above.
