//specify path to your external page:
var iframesrc="/news_content.htm"

//You may change most attributes of iframe tag below, such as width and height:
document.write('<iframe id="datamain" src="'+iframesrc+'" width="160px" height="280px" marginwidth="0" marginheight="0" hspace="0" vspace="0" frameborder="1" scrolling="no"></iframe>')