Sharepoint 2013 Online HTML as Calculated Column

I have a list of work orders from a production system in a Sharepoint List.
I wish to concat the work order to the URL of the production system site in order to render a clickable link directly from the Sharepoint list.
I see some have used the workaround as per http://sharepoint.rackspace.com/calculated-columns-tutorial
and http://sharepointhannah.wordpress.com/2014/06/11/adding-an-image-link-via-calculated-column-on-a-list-with-html-directory-list-solution/ but
cannot get the column to render after I have added the html tags.  Here is what the field setup looks like with just a static test URL.  Calculated Column Test HTML Markup.  And here is the result - no error, but no data returned as per the blogs I was able to find.  Result of Calculated Column Test Attempt
Thank you
LebITAsked:
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LebITAuthor Commented:
Did get a resolution from the MS Office 365 Community as per this link.

http://community.office365.com/en-us/f/154/p/278604/851104.aspx#851104

To follow up final solution, my code was missing both the single quotes and a description between the tags.  For what its worth, here's the final logic I used in that column and it does exactly what we need, opening the link to another system in a new tab.

The final column (red arrow) "Work Order" with the link and a mouse-over 'tooltip' using the html title attribute with the work order.

Working Link
The code logic to only display a link when a work order id exists.

Code
The edit column final settings that work correctly.

Calculated Column Final Settings
And the new link opened from SharePoint Online to another system in a new tab.

External System Link
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