JS get browser user information and create different versions of Flash components

This is a use of the code in the Flash site, he is using JS to obtain browser user information and then create a different version of the Flash component instances, so good compatible with most of the mainstream browser OK.
*/
var Isie = (Navigator.appversion.indexof ("MSIE")!=-1)? True:false;

var Iswin = (Navigator.appversion.tolowercase (). indexof ("Win")!=-1)? True:false;

var Isopera = (Navigator.useragent.indexof ("opera")!=-1)? True:false;

function Controlversion ()

{

var version;

var Axo;

var e;

Note:new ActiveXObject (Strfoo) throws a exception if Strfoo isn ' t in the registry

try {

Version'll is set for 7.x or greater players

Axo = new ActiveXObject ("shockwaveflash.shockwaveflash.7");

Version = Axo.getvariable ("$version");

catch (e) {

}

if (!version)

{

try {

Version'll is set for 6.x players only

Axo = new ActiveXObject ("shockwaveflash.shockwaveflash.6");

Installed player is some revision of 6.0

GetVariable ("$version") crashes for versions 6.0.22 through 6.0.29,

So we have to be careful.

Default to the

Version = "Win 6,0,21,0";

Throws if Allowscripaccess does not exist (introduced in 6.0r47)

Axo.allowscriptaccess = "Always";

Safe to call for 6.0r47 or greater

Version = Axo.getvariable ("$version");

catch (e) {

}

}

if (!version)

{

try {

Version'll is set for 4.x or 5.x player

Axo = new ActiveXObject ("shockwaveflash.shockwaveflash.3");

Version = Axo.getvariable ("$version");

catch (e) {

}

}

if (!version)

{

try {

Version'll is set for 3.x player

Axo = new ActiveXObject ("shockwaveflash.shockwaveflash.3");

Version = "Win 3,0,18,0";

catch (e) {

}

}

if (!version)

{

try {

Version'll is set for 2.x player

Axo = new ActiveXObject ("Shockwaveflash.shockwaveflash");

Version = "Win 2,0,0,11";

catch (e) {

Version =-1;

}

}

return version;

}
</script>