var browser_used=navigator.userAgent.toLowerCase();

var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);

var is_ie   = (browser_used.indexOf("msie") != -1);
var is_mac    = (browser_used.indexOf("mac")!=-1);


var is_ie5  = (is_ie && (is_major == 4) && (browser_used.indexOf("msie 5.0")!=-1) );

var is_nav  = ((browser_used.indexOf('mozilla')!=-1) && (browser_used.indexOf('spoofer')==-1)
                && (browser_used.indexOf('compatible') == -1) && (browser_used.indexOf('opera')==-1)
                && (browser_used.indexOf('webtv')==-1));

if (is_mac)
        {
                // detect if ie5

                if(is_ie5)
                {
                        document.write("<LINK REL=stylesheet HREF='ie5mac.css' TYPE='text/css'>");
                }
                else
                {
                        // if not load mac
                        document.write("<LINK REL=stylesheet HREF='macdefault.css' TYPE='text/css'>");
                }
        }
        else
        {
                // if not mac then

                if(is_ie)
                {
                        // if ie5
                        document.write("<LINK REL=stylesheet HREF='style3.css' TYPE='text/css'>");
                }
                else
                {
                        // else if netscape or opera
                        document.write("<LINK REL=stylesheet HREF='style3.css' TYPE='text/css'>");
                }


        }