Firefox window.open not a function

Question

I know that this problem is in many question but I haven't found a solution to my problem.

This is the original code top open a popup:

<script type="text/javascript">
   window.open("link.php", "_blank");
</script>

The code works fine in all browser except Safari. To solve this I have create this code:

<script type="text/javascript">
   var open = window.open("link.php", "_blank");
   if (open == null || typeof(open)=='undefined')
        alert("Turn off your pop-up blocker!");
</script>

Now this code in firefox return me this error:

TypeError: window.open is not a function
var open = window.open("link.php", "_blank");

How can I solve this problem?

Answer 1

Change your code a little bit like this

<script type="text/javascript">
 var _open = window.open("link.php", "_blank");
  if (_open == null || typeof(_open)=='undefined')
    alert("Turn off your pop-up blocker!");
  else
</script>

This should work now. The problem was that you're overwriting the window.open function using the global variable open