function checkIframe(f) {
	// change iframe height to whatever looks tidy (NOTE: take left-hand nav into account)
	document.getElementById(f).height = 492;
	//find the height of the internal page
	var the_height = document.getElementById(f).contentWindow.document.body.scrollHeight;
	//change the height of the iframe
//	document.getElementById('ansford_padding').height = the_height;
	document.getElementById('main').height=the_height+20;
}