var os = navigator.platform;
	var brName = navigator.appName.charAt(0);
	var brVer = navigator.appVersion.charAt(0);
	var brType ="";
	var uagent = navigator.userAgent;	//OS・ブラウザ情報チェック

	if(os == "Win32"){ 
		if((brName == "N") && (brVer >= 4) && (brVer < 5)){
			cssSrc = '<LINK REL="stylesheet" TYPE="text/css" HREF="/css/win_nc.css">' ;
		} 
		else if((brName == "N") && (brVer >= 5)) {
			cssSrc = '<LINK REL="stylesheet" TYPE="text/css" HREF="/css/win_nc6.css">' ;
		} 
		else if((brName == "M") && (brVer >= 4)) {
		 cssSrc = '<LINK REL="stylesheet" TYPE="text/css" HREF="/css/win_ie.css">' ;
		}
	} 
	else if(os == "MacPPC"){
		if((brName == "N") && (brVer >= 4) && (brVer < 5)){
			cssSrc = '<LINK REL="stylesheet" TYPE="text/css" HREF="/css/mac_nc.css">' ;
		} 
		else if((brName == "N") && (brVer >= 5)) {
			cssSrc = '<LINK REL="stylesheet" TYPE="text/css" HREF="/css/mac_nc6.css">' ;
		} 
		else if(uagent.indexOf('MSIE 4.')>=0) {
			cssSrc = '<LINK REL="stylesheet" TYPE="text/css" HREF="/css/mac_ie4.css">' ;
		}
		else if(uagent.indexOf('MSIE 5.')>=0) {
			cssSrc = '<LINK REL="stylesheet" TYPE="text/css" HREF="/css/mac_ie.css">' ;
		}
	}
	document.write ('<LINK REL="stylesheet" TYPE="text/css" HREF="/css/common.css">');
	document.write( cssSrc ) ;