function chooseCSS() {
	var intElemClientWidth = document.documentElement.clientWidth;
	if (intElemClientWidth < 421)
{
	document.write('<link href="../css/bmbMobile2.css" type="text/css" rel="stylesheet" />');
}
else
{
	document.write('<link href="../css/bmbv4.0.css" type="text/css" rel="stylesheet" />');
}
}