function ChangeIFrameSource(frame, source) {
	var fr = document.getElementById(frame);
	fr.src = source;
	fr.style.display = 'block';
 }
 
 function HideIFrame(frame) {
	var fr = parent.document.getElementById (frame);
	if(fr.style.display == 'none') {
		fr.style.display = 'block';
	}
	else {
		fr.style.display = 'none';
	}
}