var browserName=navigator.appName;
if (browserName=="Microsoft Internet Explorer") 
{
//load ie friendly stylesheet
document.write('<link rel="stylesheet" href="css/ie.css" type="text/css">')
document.write('<link rel="stylesheet" href="css/thickbox.css" type="text/css">')
}
else
{
if ((parseFloat(navigator.appVersion)) >= 5 )
{
// if ns version is great than or equal to 5 (6) load this stylesheet
document.write('<link rel="stylesheet" href="css/styles.css" type="text/css">')
document.write('<link rel="stylesheet" href="css/thickbox.css" type="text/css">')
} else {
//if you have a really ancient browser ;-) (ie. NS 4.7 or earlier) load this stylesheet
document.write('<link rel="stylesheet" href="css/styles.css" type="text/css">')
document.write('<link rel="stylesheet" href="css/thickbox.css" type="text/css">')
}
}