Avoid iframe url affecting browser's back button

I have a web page where I have two iframes. I set the url (location) of the iframes in the page onload event. This is done to "delay load" the content. That is, the main page content is rendered first, then the iframe content with e.g. Like buttons, trust logos etc. are displayed. Thi开发者_C百科s speeds up the page rendering considerably.

However...

Clicking the back button first removes the trust logo. Then another back button click removes the Like buttons. The third click finally takes the user to the previous page.

Is there any way to avoid the URLs of the iframes to go into the browser history, while maintaining the above functionality?

Thanks!

Avoid using iFrames, if you really want to improve rendering like this, use AJAX. However there are numerous other problems if your page actually renders slow, how large is it, and how is it structured?