function calcHeight(frm){
		  //find the height of the internal page
		  var the_height = document.getElementById(frm).contentWindow.document.body.scrollHeight;
		
		  //change the height of the iframe
		  document.getElementById(frm).height = the_height;
		}
		
		// change text size
		function changeFontSize(value){
		var fts = document.getElementById("bdtext");
		for (var i=0;i<fts.getElementsByTagName("p").length;i++) {
			fts.getElementsByTagName("p")[i].style.fontSize = value +"px";
		}
		}