Internet Explorer, String.concat() and Javascript 1.5

Hello, Internet Explorer... have you ever tried to join two strings together?

Not add them ambigiously with

"a" + "b"

but

String.concat("a", "b");

them?

I'm guessing none of your developers ever has, because it doesn't work.


Why this acceptable:

String.fromCharCode(12);

but for concat, you have to do:

String("a").concat("b");

?

Ridiculous.