prefix="";
if (css_prefix) {
	prefix="../";
}
ua=navigator.userAgent.toLowerCase();
opera = (ua.indexOf("opera")!=-1);
ie = (ua.indexOf("msie")!=-1) && (ua.indexOf("opera")==-1);
nn = (ua.indexOf('mozilla')!=-1) && (ua.indexOf('spoofer')==-1) && (ua.indexOf('compatible') == -1) && (ua.indexOf('opera')==-1) && (ua.indexOf('webtv')==-1) && (ua.indexOf('hotjava')==-1);
nn4 = (nn && parseInt(navigator.appVersion)==4);
nn6 = (nn && parseInt(navigator.appVersion)>4);

// this line is used for testing
// alert ("opera= " + opera + "\nie= " + ie + "\nnn4= " + nn4 + "\nnn6= " + nn6);

if (opera) {
 document.write('<link href="'+prefix+'stylesheets/opera.css" rel="stylesheet" type="text/css">');
}
else if (ie) {
 document.write('<link href="'+prefix+'stylesheets/ie.css" rel="stylesheet" type="text/css">');
}

else if (nn4) {
 document.write('<link href="'+prefix+'stylesheets/nn4.css" rel="stylesheet" type="text/css">');
}
else if (nn6) {
 document.write('<link href="'+prefix+'stylesheets/nn6.css" rel="stylesheet" type="text/css">');
}
else {
 document.write('<link href="'+prefix+'stylesheets/general.css" rel="stylesheet" type="text/css">');
}