I am using a TextArea in flash and setting its htmlText property to contain the following link:
txtMyTextArea.htmlText = "some dynamic text here that ends in you can check this out <a href=\"http://www.google.co.uk\" target=\"_blank\">here</a>";
It works fine when I test it in flash (CTRL + Enter), although when I open the generated HTML I get the following error dialog:

How can I make the link work without receiving the security dialog?
Please keep in mind I am not in control of client machines, only the server.
You can block the pop-up and let your SWF always connect to external sites. By visiting the link below , But beware there is a lot of potential risks too.
Just visit the below link and select “Always allow”.
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager04.html