function calcHeight()
{
  document.getElementById('the_iframe').height = 100;
  var myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {

    //Non-IE
    myHeight = window.innerHeight;
  } else if( document.documentElement && document.documentElement.clientHeight ) {

    //IE 6+ in 'standards compliant mode'
    myHeight = document.documentElement.clientHeight+10;
  } else if( document.body && document.body.clientHeight ) {

    //IE 4 compatible
    myHeight = document.body.clientHeight;
  }

myHeight = myHeight - 10;
document.getElementById('the_iframe').height = myHeight;
}