if (navigator.appName == "Microsoft Internet Explorer") {
   			document.write('<link rel="stylesheet" type="text/css" href="tabs_ie.css" />');
}

else if (navigator.platform.substr(0,3) == "Mac" && navigator.vendor == "Apple Computer, Inc.") {
			document.write('<link HREF="style.css" REL="stylesheet" TYPE="text/css" />');
}
    
else if (navigator.vendor == "Apple Computer, Inc.") {
    		document.write('<link HREF="style.css" REL="stylesheet" TYPE="text/css" />');
}

else {
			document.write('<link HREF="style.css" REL="stylesheet" TYPE="text/css" />');	
}