Running example on JSFiddle:

[sourcecode language="javascript"]
$(document).ready(function () {
$("#TextBox1").live(‘keypress’, function (e) {
var kCode = e.keyCode || e.charCode; //cross browser check
//Mozilla and Safari define e.charCode, while IE defines e.keyCode which returns the ASCII value
if (kCode == 9) {
$("#TextBox2").focus();
}
});
});

[/sourcecode]

JavaScript Madness: Keyboard Events