function sizer(){
var the_height=document.getElementById('iframe').contentWindow.document.body.scrollHeight;//find the height of the internal page
var the_width=document.getElementById('iframe').contentWindow.document.body.scrollWidth;//find the width of the internal page

document.getElementById('iframe').style.height=the_height;//change the height of the iframe
document.getElementById('iframe').style.width=the_width;//change the width of the iframe
}