// Cutdown client-side JavaScript client sniff. Leaves out stuff we don't really need
// (1) browser vendor: 
//     is_nav, is_ie, is_opera, is_webtv, is_other (ie it's not one of the browsers we specifically test for) 
// (2) browser version number: 
//     is_major (integer indicating major version number: 2, 3, 4 ...) 
//     is_minor (float   indicating full  version number: 2.02, 3.01, 4.04 ...) 
// (3) browser vendor AND major version number 
//     is_nav2, is_nav3, is_nav4, is_nav4up, is_nav5, is_nav5up, is_ie3, is_ie4, is_ie4up 
// (4) JavaScript version number: 
//     is_js (float indicating full JavaScript version number: 1, 1.1, 1.2 ...) 
// (5) OS platform and version: 
//     is_win, is_win16, is_win32, is_win31, is_win95, is_winnt, is_win98 
//     is_os2 
//     is_mac, is_mac68k, is_macppc 
//     is_unix 
//     is_vms 
//
// Then checks for Flash and Director if we're in Netscape browsers

// convert all characters to lowercase to simplify testing 
var agt=navigator.userAgent.toLowerCase(); 

// *** BROWSER VERSION *** Note: On IE5, these return 4, so use is_ie5 or is_ie5up to detect IE5. 
var is_major = parseInt(navigator.appVersion); 
var is_minor = parseFloat(navigator.appVersion); 

// Note: Opera and WebTV spoof Navigator. 
var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1) && (agt.indexOf('webtv')==-1)); 
var is_nav2 = (is_nav && (is_major == 2)); 
var is_nav3 = (is_nav && (is_major == 3)); 
var is_nav4 = (is_nav && (is_major == 4)); 
var is_nav4up = (is_nav && (is_major >= 4)); //Careful though - just coz it works in nav4 it doesn't necessarily work in Nav5
var is_nav5 = (is_nav && (is_major == 5)); //Netscape 6 
var is_nav5up = (is_nav && (is_major >= 5)); 

var is_ie   = (agt.indexOf("msie") != -1); 
var is_ie3  = (is_ie && (is_major < 4)); 
var is_ie4  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")==-1) ); 
var is_ie4up  = (is_ie  && (is_major >= 4)); 
var is_ie5  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) ); 
var is_ie5up  = (is_ie  && !is_ie3 && !is_ie4); 
var is_5up = (is_ie5up || is_nav5up);
var is_hotjava = (agt.indexOf("hotjava")!=-1);
var is_opera = (agt.indexOf("opera") != -1); 
var is_webtv = (agt.indexOf("webtv") != -1); 
var is_firefox = (agt.indexOf("firefox") != -1);

// *** JAVASCRIPT VERSION CHECK *** 
var is_js; 
if (is_nav2 || is_ie3) is_js = 1.0 
else if (is_nav3 || is_opera) is_js = 1.1 
else if ((is_nav4 && (is_minor <= 4.05)) || is_ie4) is_js = 1.2 
else if ((is_nav4 && (is_minor > 4.05)) || is_ie5) is_js = 1.3 
else if (is_nav5) is_js = 1.4 
// NOTE: In the future, update this code when newer versions of JS are released. For now, we try to provide some upward compatibility 
// so that future versions of Nav and IE will show they are at *least* JS 1.x capable. Always check for JS version compatibility  with > or >=. 
else if (is_nav && (is_major > 5)) is_js = 1.4 
else if (is_ie && (is_major > 5)) is_js = 1.3 
// HACK: no idea for other browsers; always check for JS version with > or >= 
else is_js = 0.0; 

// *** PLATFORM ***
var is_win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
var is_os2   = ((agt.indexOf("os/2")!=-1) || (navigator.appVersion.indexOf("OS/2")!=-1) || (agt.indexOf("ibm-webexplorer")!=-1));
var is_mac    = (agt.indexOf("mac")!=-1);
var is_linux = (agt.indexOf("linux")!=-1);

var is_flash = false;
var is_flash_version = 0;
var is_director = false;
//CheckPlugins if in Netscape
if (is_nav) {
	var intPlugins = navigator.plugins.length;
	if (intPlugins > 0)	{
		var intCtr = 0;
		var objPlugin;
		while (intCtr < intPlugins)	{
			objPlugin = navigator.plugins[intCtr];
			if (is_flash == false) {
				if (navigator.mimeTypes && navigator.mimeTypes["application/x-shockwave-flash"] &&  
						navigator.mimeTypes["application/x-shockwave-flash"].enabledPlugin && (objPlugin.description.indexOf("Flash")!=-1)) {
					intPos = objPlugin.description.indexOf("Flash");
					is_flash_version = parseInt(objPlugin.description.substring((intPos+6), (intPos+7)));
					if (is_flash_version > 2 ) is_flash = true;		
				}
			}
			if (is_director == false) {
				is_director = navigator.mimeTypes && navigator.mimeTypes["application/x-director"] && navigator.mimeTypes["application/x-director"].enabledPlugin?true:false;
			}
			intCtr++;
		} // end of while loop
	}
}

//this function deals with redirecting from friendly URLs e.g natwest.com/corporate/. it ensures sniffer is invoked
var path;//is assigned the incoming redirect path - passed across from relevant index pages

function redirect(destination)
{	
if (is_nav5up){ 			
	alert("We are currently testing our website with the Netscape 6 browser. At this stage, we cannot guarantee that you will be able to experience the full benefits of the website");
	path = destination;
}
else if (((is_nav4 || is_ie4up) && is_win) || ( is_nav4 && is_mac)){
	path = destination;
}
else{
	path = "/index_holding.htm?path="+destination;
	}
window.location.replace(path);
}