IE9 Security warning

IE9 Security warning

I have a webview embedded on a website. It is working exactly as expected in Chrome and FF.

Unfortunately, in IE9, it is prompting a security warning. It is also refusing to download all content without the user agreeing to download "unsecure" information. 

This is a huge issue! It is imperative that the use of Zoho is transparent to the user. If they get prompted about a security issue, a lot of users are likely to go away.

How do I prevent this from happening? Please don't tell me to change my IE9 settings - I won't have that opportunity with people using my site who come in from IE9.

Thanks!