Help with JavaScript For Loops and iFrames Please!!

Hi,

I want to load a series of pages into an iFrame and then do something with the contents. The following code works fine with just one page loaded into the iFrame:

function loadDocs() {
    frames("docframe").location.href = docs[0];
    setTimeout("doNextFunction();", 1000);
}

Code (markup):

Like I say, this works fine and calls the next function after ample time for the iFrame doc to load. However, docs is an array and as soon as I put the above code into a for loop so that all items in the array can be loaded (one after the other with doNextFunction() acting on all of them), it stops working. This is what I have tried:

function loadDocs() {
  for (x = 0; x < docs.length; x++) {
    frames("docframe").location.href = docs[x];
    setTimeout("doNextFunction();", 1000);
  }
}

Code (markup):

Anyone see what I'm doing wrong? Any pointers would be *hugely* appreciated