function iFrameHeight() {
	if(window.innerHeight != undefined) {
		height = window.innerHeight;
	} else {
		height = document.documentElement.clientHeight;
	}
	// header & footer height
	iHeight = 320;
	
	iMinHeight = 230;
	
	if ((height - iHeight) < iMinHeight) {
		height = iMinHeight;
	} else {
		height -= iHeight;
	}
	if (document.getElementById('iframe') != undefined) {
		document.getElementById('iframe').style.height =  height + 'px';
	}
}
window.onresize = iFrameHeight;