Textarea (additional field) on Product Page

Hi,

I'd need a textarea (field) beside the picture of the product page.
We got a lot of different informations we need to display on the right side of the picture.
We don't want to fill out one field after the other but just one textarea field.
I tried to add a textarea in the custom fields xml (fields.xml) like this:

<config>
<fields name="params">
<fieldset name="basic">
<field name="field_upc" type="text" label="Custom Field 1 (UPC)" size="50" description="Universal Product Code"></field>
<field name="field_ean" type="text" label="Custom Field 2 (EAN)" size="50" description="European Article Number"></field>
<field name="field_ispn" type="text" label="Custom Field 3 (ISPN)" size="50" description="International Standard Book Number"></field>
<field name="field_mpn" type="text" label="Custom Field 4 (MPN)" size="50" description="Manufacturer Part Number"></field>
<field name="field_location" type="text" label="Custom Field 5 (Location)" size="50" description="Location of Product"></field>
<textarea id="text" name="text" cols="35" rows="4"></textarea>
</fieldset>
</fields>
</config>

But after I added the line and saved the file (no matter via ftp direct editing or via administration in joomla) all the rest after my additional line has been deleted and it looked like this:

<config>
<fields name="params">
<fieldset name="basic">
<field name="field_upc" type="text" label="Custom Field 1 (UPC)" size="50" description="Universal Product Code"></field>
<field name="field_ean" type="text" label="Custom Field 2 (EAN)" size="50" description="European Article Number"></field>
<field name="field_ispn" type="text" label="Custom Field 3 (ISPN)" size="50" description="International Standard Book Number"></field>
<field name="field_mpn" type="text" label="Custom Field 4 (MPN)" size="50" description="Manufacturer Part Number"></field>
<field name="field_location" type="text" label="Custom Field 5 (Location)" size="50" description="Location of Product"></field>
<textarea id="text" name="text" cols="35" rows="4"></textarea>

of course it crashes the shop.

So how could I realize that?

Another way would be to display the default short description.
But I can't manage to show the content of the short description on the product detail page, right beside the picture.

I tried to explain it at the attached screenshot too.
Thank you for your help in advance.
Tina