var ua = navigator.userAgent.toLowerCase() ;
//var win = ua.indexOf("win") != -1 ;
var mac = ua.indexOf("mac") != -1 ;
var ff = ua.indexOf("firefox") != -1 ;
var ns = ua.indexOf("netscape") != -1 ;
var camino = ua.indexOf("camino") != -1 ;
				//if(win && ff){
					  //document.write ('<link rel="stylesheet" type="text/css" href="/css/win_gecko.css">')
				//}
				//if(win && ns){
					 //document.write ('<link rel="stylesheet" type="text/css" href="/css/win_gecko.css">')
				//}
				//if(mac && ff){
				//	  document.write ('<link rel="stylesheet" type="text/css" href="/css/mac_gecko.css">')
				//}
				if(mac && ns){
					  document.write ('<link rel="stylesheet" type="text/css" href="/css/mac_gecko.css">')
				}
				if(mac && camino){
					  document.write ('<link rel="stylesheet" type="text/css" href="/css/mac_gecko.css">')
				}