function iFrameHeight() {
	if(document.getElementById && !(document.all)) {
		h = document.getElementById('blockrandom').contentDocument.body.scrollHeight;
		document.getElementById('blockrandom').style.height = h + 200;
alert('eerste');
	}
	else if(document.all) {
		h = document.frames('blockrandom').document.body.scrollHeight;
		document.all.blockrandom.style.height = h+200;
	}
}