// link to appropriate css file
var isMac = false;

	if (navigator.platform && (navigator.platform.indexOf('Mac')) > -1) {
		//mac users
		isMac = true;
	    document.write('<link href="include/mac.css" rel="stylesheet" type="text/css">');
		} 
	else {
	    //windows or unix
	    if (navigator.appName.indexOf('Microsoft') > -1) {
		    //explorer
		    document.write('<link href="include/main1.css" rel="stylesheet" type="text/css">');
	    	} 
		else {
		    //netscape			
		    document.write('<link href="include/win_ns.css" rel="stylesheet" type="text/css">');
	    }
   	}