JavaScript: Shift character values by 1 for every character

How can I increase the value of all characters by one value?  "A" should become "B" and "1" should become "2":

var x = '123abc';
alert( shift(x) ); // should alert('234bcd');

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clockwatcherConnect With a Mentor Commented:
Here's another (perhaps little bit easier to follow) way:
function shift_char(v) {
    var retval = '';
    for (var i=0; i <= v.length; i++) {
        retval += String.fromCharCode(v.charCodeAt(i) + 1);
    return retval;

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Here's one way:
        var x = '123abc';
        alert(x.replace(/(.)/g, function (x,p1) { return String.fromCharCode(p1.charCodeAt(0)+1) }));

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