Much to every developers pain we often find that JavaScript that is functional in one browser is not functional in other browsers.  Recently the update to Safari 3 requrired that the window open command to not contain the url. As it would fail to open a window if it did, the simple fix was to create a new window with no url and set the url after creating the window. However as other brothers do not require this we can set up a two step process in that we try to open the window normally and if it fails then we open one with no url defined.

function create_popup( url, win_title, win_options )
{
  var popWin = window.open( url, win_title, win_options );
  if( !popWin ) {
    popWin = window.open('', win_title, win_options);
    popWin.location.href = url;
  }
}

popWin