//specify path to your external page:
var iframesrc="/testimonials.html"

//You may change most attributes of iframe tag below, such as width and height:
document.write('<div id="datamain" src="'+iframesrc+'" width="100%" height="150px" marginwidth="0" marginheight="0" hspace="0" vspace="0" frameborder="0" scrolling="no" style="max-width:200px;max-height:150px;"></div>')