var _agent = navigator.userAgent.toLowerCase();

var _win = (_agent.indexOf('win') != -1);
var _mac = (_agent.indexOf('mac') != -1);

var _major = parseInt(navigator.appVersion);
var _minor = parseFloat(navigator.appVersion);

var _ns    = ((_agent.indexOf('mozilla') != -1) && (_agent.indexOf('compatible') == -1));
var _ns2   = (_ns && (_major == 2));
var _ns3   = (_ns && (_major == 3));
var _ns4   = (_ns && (_major == 4));
var _ns4up = (_ns && (_major >= 4));
var _nav   = (_ns && ((_agent.indexOf(';nav') != -1) || (_agent.indexOf('; nav') != -1)));
var _ns6   = (_ns && (_major == 5));
var _ns61  = (_ns6 && (_agent.indexOf('netscape6/6.1') != -1));
var _ns62  = (_ns6 && (_agent.indexOf('netscape6/6.2') != -1));

var _ie    = (_agent.indexOf('msie') != -1);
var _ie3   = (_ie && (_major < 4));
var _ie4   = (_ie && (_major == 4) && (_agent.indexOf('msie 5') == -1));
var _ie4up = (_ie && (_major >= 4));
var _ie45  = (_ie && (_minor == 4.5));
var _ie5   = (_ie && (_major == 4) && (_agent.indexOf('msie 5') != -1));
var _ie5up = (_ie && !_ie3 && !_ie4);
var _ie6   = (_ie && (_major == 4) && (_agent.indexOf('msie 6') != -1));

var _aol   = (_agent.indexOf('aol') != -1);
var _aol3  = (_aol && _ie3);
var _aol4  = (_aol && _ie4);

var _opera = (_agent.indexOf('opera') != -1);

var _icab = (_agent.indexOf('icab') != -1);

var _safari  = (_agent.indexOf('safari') != -1);

var cssDir = '/common/css/';
var cssTags = '<link rel="stylesheet" type="text/css" href="';
var flag = null;


if (_win) { // win os
	if (_ns6) { // win_ns 6.x
		flag = 'wns6';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="WinNS6_style">');
		document.close();
	}
	else if (_ns4 || _ns4up || _nav) { // win_ns 4.x
		flag = 'wns';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="WinNS_style">');
		document.close();
	}
	else if (_ie4 || _ie4up || _ie5 || _ie5up) { // win_ie
		flag = 'wie';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="WinIE_style">');
		document.close();
	}
	else {
		flag = 'wie';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="WinIE_style">');
		document.close();
	}
}

else if (_mac) { // mac os
	if (_ns6) { // mac_ns 6.x
		flag = 'mns6';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="MacNS6_style">');
		document.close();
		//alert(_rich);
	}
	else if (_ns4 || _ns4up || _nav) { // mac_ns 4.x
		flag = 'mns';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="MacNS_style">');
		document.close();
	}
	else if (_ie5 || _ie5up) { // mac_ie
		flag = 'mie';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="MacIE_style">');
		document.close();
	}
	else if (_ie4 || _ie45 || _ie4up) { // mac no support browser
		flag = 'mie';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="MacIE_style">');
		document.close();
	}
	else if (_opera) {
		flag = 'opera';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="Opera_style">');
		document.close();
	}
	else if (_safari) {
		flag = 'safari';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="MacSafari_style">');
		document.close();
	}
	else {
		flag = 'mie';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="MacIE_style">');
		document.close();
	}
}

else {
	flag = 'other';
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="MacIE_style">');
		document.close();
}