Java Script / html automatic refresh page

HTML and java script
I have a webpage of 15 different iFrames. Each iFrame goes to a different website.
I have a couple of wants
I want the page to refresh each frame in a time period of about 5 min.

I want it to immediatly try to refresh frames that display a "Internet Explorer Could Not Find a page to display" 404 message every 30 seconds.

I'm just not sure how to do it all.

for( var i = 0; i < 15; i++)
{
   if( theDocumentIFrameTitle isEqualTo "404 error message" )
   {
      reload iFrame in 30 seconds;
      theDocument.reload(iFrameInQuestion);
   }
   else 
      reload iFrame in 5 min;
}