if (BrowserDetect.browser == "Firefox") {
    document.write("<link rel='stylesheet' href='"+ROOT_DIR+"css/ff.css' type='text/css'>");
}
else if (BrowserDetect.browser == "Explorer"){
   if (BrowserDetect.version>=7){
	  document.write("<link rel='stylesheet' href='"+ROOT_DIR+"css/ie7.css' type='text/css'>");
   }
   else
   {
	  document.write("<link rel='stylesheet' href='"+ROOT_DIR+"css/ie6.css' type='text/css'>");
   }
}
else if (BrowserDetect.browser == "Safari") {
    document.write("<link rel='stylesheet' href='"+ROOT_DIR+"css/safari.css' type='text/css'>");
}
else if (BrowserDetect.browser == "Opera") {
    document.write("<link rel='stylesheet' href='"+ROOT_DIR+"css/opera.css' type='text/css'>");
}