var vNum = navigator.appVersion.charAt(0);
var bName = navigator.appName.charAt(0);

if(navigator.appVersion.indexOf("Mac") > -1)
{
	if( bName == "M")
	 {
		// MAC IE
		var SetCss = "m_ie";
	}
	else
	{
		if( vNum < 5 )
		{
			// MAC NETSCAPE 4.x
		var SetCss = "m_nn4";
	 	}
	 	else
	 	{
			// MAC NETSCAPE 6.x~
		var SetCss = "m_nn6";
	 	}
	 }

}
else
{
	if( bName == "M")
	{
		// WIN IE
		var SetCss = "w_ie";
	}
	else
	{
		if( vNum < 5 )
		{
			// WIN NETSCAPE 4.x
		var SetCss = "w_nn4";
		}
		else
		{
			// WIN NETSCAPE 6.x~
		var SetCss = "w_nn6";
		}
	}
}
SetCss = '<link rel="stylesheet" type="text/css" href="/mcommon/css/'+SetCss+'.css">';
document.writeln(SetCss);