gistfile1.js

function moveLast(target) {
    if (target.nodeName.toLowerCase() != 'input' || target.type != 'text') return false;
    var pos = target.value.length;
    target.focus(); 
    if (target.createTextRange) {
        var range = target.createTextRange(); 
        range.move("character", pos); 
        range.select(); 
    } else if (target.setSelectionRange) {
        target.setSelectionRange(pos, pos);
    }
}