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

//You may change most attributes of iframe tag below, such as width and height:
document.write('<iframe id="datamain" src="'+iframesrc+'" width="200px" height="125px" marginwidth="0" marginheight="0" hspace="0" vspace="0" frameborder="0" scrolling="no"></iframe>')