//specify path to your external page:
var iframesrc="scroll.php"

//You may change most attributes of iframe tag below, such as width and height:
document.write('<iframe id="datamain" src="'+iframesrc+'" width="233px" height="170px" marginwidth="0" marginheight="0" frameborder="0" scrolling="no" allowtransparency="true" style="background-color: transparent;"></iframe>')