SSL insecure objects

On my page https://ol-shop.at/index.php?route=account/login it seems to be that there are insecure objects. Could someone please help me, taking a look on the source code. I don't know which url or object could be insecure. Th开发者_StackOverflow社区anks.

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Perhaps http://ol-shop.at/image/secure_site2.gif?

This source: TrustLogo("http://ol-shop.at/image/secure_site2.gif", "SC4", "none");