var newwindow;
        function OpenPopUpWindow(url, features)
        {
	        newwindow=window.open(url,'name',features);
	        if (window.focus) {newwindow.focus()}
        }     


function calcHeight()
{
  //find the height of the internal page
  var the_height=
    document.getElementById('the_iframe').contentWindow.
      document.body.scrollHeight;

  //change the height of the iframe
  document.getElementById('the_iframe').height=the_height;
}