摆脱IE下载警告

I have a web-page with complicated form. Also, there is a button "preview", which is using jquery to collect form data, post it to server, the server generates .rtf or .txt document and returns a link to created file to client. Afterwards, I need user to automaticly download this file. To do this, I open this received link programmaticly in callback function. Everything works fine, except for IE7-8, in which the security bar appears, preventing download (which is unacceptable, due to it will refresh the form). I assume this happens because of "non-active click", but I cannot figure out how to get rid of this behaviour.

This is security concern, and it should be there, to prevent scripted download of files, without confirmation of user.

Don't generate .rtf/.txt files for preview, use HTML to preview. When user will want .rtf/.txt, he will download it, when you want just a preview, use WYSIWYG editor, to handle documents, like Google documents does.