Maybe I misunderstood. Is your data source your site? If so, ignore my observations about TOS; if not, I repeat, "beware!"

The balance of your first graf suggests that stockta.com is the IP of some other entity, but if that entity approves of you using their data, they likely have a published API. Ask. And if they don't approve? Well refer to para 1.

How did using

<c><table width="34%" border="1">
<tr>
<td>aaa</td><td>bbb ccc ddd></td><td>2012-12-04</td><td>foo</td><tr>
...</table> -- ie, html here</c>
[download]

fail? Note that the closing tag is -- as is customary (or, as here, required) </c> ... with a slash!

Even raw html renders so long as it's of a reasonable width (and within the limits allowed by the fact that PM's html is restricted):

a a a	ab bb	2012-12-04	foo
12345	0987654321zyx	20121204 16:49	bar