<script>
	// IE or NN , Other のブラウザ判断
	if (window.navigator.userAgent.indexOf("MSIE ") >= 0){
		alert("IE");
	}else if (window.navigator.userAgent.indexOf("Netscape") >= 0){
		alert("NN");
	}else if (window.navigator.userAgent.indexOf("Firefox") >= 0){
		alert("Firefox");
	}else{
		alert(window.navigator.userAgent);
	}
</script>