function checksize() {
	if (document.body.clientWidth < 950) {
		document.getElementById("content_wrap").className = "fixed";
	} else {
		document.getElementById("content_wrap").className = "notfixed";
	}
}

onload = function bla() {
	if (document.all) {
		checksize();
		onresize = checksize;
	}
}