function calcHeight() {

	try {
		the_height= document.getElementById('maindata').contentWindow.document.body.scrollHeight;
	}
	catch (error) {
		the_height = '2000';		
	}
  
  

	document.getElementById('iframe').style.height = the_height;
	document.getElementById('maindata').height = the_height;
	scroll(0,0);
  //document.getElementById('debug').innerHTML=  the_height;
}