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disable local back button when specific page loads in iframe

I have a back button on my main site.  I have a blog (with blogger) that loads into an iframe.  I also have a cname from my site pointing there, so blog.mysite.com.  I'm assuming the browsers are referencing it as a different site.  So that's what I'm trying to do, disable the back button once my blog is up, but have it enabled any other time.  I've tried multiple things that I think should work, but none have so far.  I figured I could pass a function from the blog site up to the parent, but nothing so far.  Thanks in advance
1 Solution
If what you are tying to do is prevent the person from accidently hitting back then i think you should use the window.onunload javscript event. I dont think there is any good way to disable the back button otherwise.
DimitrisSenior Solution ArchitectCommented:
Yes the back button can not be disabled in any way.

Only the Javascript as Thomas says is a solution but I don't know if its a good idea because you may create a kind of annoying message for the users...
pro-tekAuthor Commented:
It's a scripted back button, not the browser back, so what I ended up doing was made another page1 (on my domain) put the script in to dissable the back button on my page and nested blog.mysite.com on that page1. Then on the main page the src is now page1 instead of blog.mysite.com and that took care of it.  
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