var d = document.getElementById('flashhoofdmenu');

//W3C
if(d.addEventListener) {
	d.addEventListener('mouseover',resize400,false);
	d.addEventListener('mouseout',resize24,false);
}

//Microsoft
else if(d.attachEvent){
	d.attachEvent('onmouseover',resize400);
	d.attachEvent('onmouseout',resize24);
}

function resize400(){
	var isIE=(navigator.appName.indexOf("Microsoft")!=-1)?1:0;
	d.height = '400';
	if (isIE) {
		document.getElementById('hiddeniframe').style.display = 'block';
		document.getElementById('hiddeniframe').style.filter='progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)';
		document.getElementById('hiddeniframe').style.width = 600;
		document.getElementById('hiddeniframe').style.height = d.height;
	}
}
function resize24(){
	d.height = '24';
	document.getElementById('hiddeniframe').style.display = 'none';
}