function fitHeight(h) {
    var myHeight = 0;
    if( typeof( window.innerWidth ) == 'number' ) {
      //Non-IE
      myHeight = window.innerHeight;
    } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
      //IE 6+ in 'standards compliant mode'
      myHeight = document.documentElement.clientHeight;
    } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
      //IE 4 compatible
      myHeight = document.body.clientHeight;
    }
    if (h > myHeight - 90)
      document.main_image.height = myHeight - 90;
}