Hi, i try this script to check browser version and redirect the user to update their browser:
Code:
function get_browser_version(){
  var N=navigator.appName, ua=navigator.userAgent, tem;
  var M=ua.match(/(opera|chrome|safari|firefox|msie)\/?\s*(\.?\d+(\.\d+)*)/i);
  if(M && (tem= ua.match(/version\/([\.\d]+)/i))!= null) M[2]= tem[1];
  M=M? [M[1], M[2]]: [N, navigator.appVersion, '-?'];
  return M[1];
}

var browser = navigator.appName;
var version = get_browser_version();

if (browser=="Microsoft Internet Explorer") { 
    if (version<="9.1") 
        document.location.href="upgrade.php" 
} 
if (browser=="Safari") { 
	if (version<="6.0") 
		document.location.href="upgrade.php"  
	} 
if (browser=="Firefox") { 
	if (version<="5.0") 
		ddocument.location.href="upgrade.php" 
	} 
if (browser=="Chrome") { 
	if (version<="15.0") 
		document.location.href="upgrade.php" 
} 
if (browser=="Opera") { 
	if (version<="11.10") 
		document.location.href="upgrade.php" 
}
It work prefectly for Internet Explorer but not the other browser, is there something wrong with my script here?