function adjustFrame() {
  window.frames.mainFrame.scrollBy(0,900);
  currTop = window.frames.mainFrame.document.documentElement.scrollTop;
  if (currTop > 0) {
    currHeight = document.getElementById('main').getAttribute('height');
    currHeight++;
    document.getElementById('main').setAttribute('height',currHeight);
    adjustFrame();
  }
}

function setHeight() {
  document.getElementById('main').setAttribute('height',0);
  adjustFrame();
  currHeight = document.getElementById('main').getAttribute('height');
  if (currHeight == 0) {
    document.getElementById('main').setAttribute('height',2000);
  }  	
}

function fnCheckScroll() {
  if(document.getElementById && !(document.all)) {
    var iNewHeight = document.getElementById('main').contentDocument.body.scrollHeight;
  }
  else if(document.all) {
    var iNewHeight = document.frames('main').document.body.scrollHeight;
  }
  alert("The value of the scrollHeight property is: " + iNewHeight + "px"); 
}

function setIframeHeight() {
  if(document.getElementById && !(document.all)) {
    var iNewHeight = document.getElementById('main').contentDocument.documentElement.scrollHeight;
  }
  else if(document.all) {
    var iNewHeight = document.frames('main').document.body.scrollHeight;
  }
  document.getElementById('main').setAttribute('height',iNewHeight);
}


function setOjectHeight() {
//  alert("NewHeight=");
  var NewHeight = document.getElementById('main').contentDocument.documentElement.scrollHeight;
  var objectHeight = document.getElementById('main').scrollHeight;
  document.getElementById('main').setAttribute('height',NewHeight);
}