var Dom_NN4		= false;
var Dom_NN6		= false;

//Mac or Win判定
var Dom_mac = false;
var Dom_win = false;

Dom_mac=navigator.userAgent.indexOf('Mac')!=-1;
if(!Dom_mac)
{
	Dom_win = true;
}

//NN or IE判定
var Dom_IE = false;
var Dom_NN = false;

Dom_IE= navigator.userAgent.indexOf('MSIE') != -1;
if(!Dom_IE)
{
	Dom_NN= navigator.userAgent.indexOf('Mozilla') != -1;
}

if(Dom_NN)
{
	//NN Version判定
	Dom_NN4= navigator.userAgent.indexOf('Mozilla/4') != -1;
	//Netscape6.2以上の場合Dom_NN6はtrue
	Dom_NN6= navigator.userAgent.indexOf('Netscape6') != -1;
	//NN4.x,6.x以外のNNはNN6として処理
	if(Dom_NN4 != true && Dom_NN6 != true)
	{
		Dom_NN6=true;
	}
}



<!--
if( Dom_mac && Dom_NN )
{ document.write("<link rel='stylesheet' href='/css/mac_nn.css' type='text/css'>"); }
else if( Dom_mac && Dom_IE )
{ document.write("<link rel='stylesheet' href='/css/mac_ie.css' type='text/css'>"); }
else if( Dom_win && Dom_NN4 )
{ document.write("<link rel='stylesheet' href='/css/win_nn4.css' type='text/css'>" );}
else if( Dom_win && Dom_NN6 )
{ document.write("<link rel='stylesheet' href='/css/win_nn.css' type='text/css'>"); }
else
{ document.write("<link rel='stylesheet' href='/css/win_ie.css' type='text/css'>"); }

function openWin(url) {
     window.open(url,"_blank","width=420,height=420,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,favorites=no,resizable=yes");
}

//-->