Autoresize textarea

gistfile1.js

var observe;
if (window.attachEvent) {
    observe = function (element, event, handler) {
        element.attachEvent('on'+event, handler);
    };
}
else {
    observe = function (element, event, handler) {
        element.addEventListener(event, handler, false);
    };
}
function autoresize(element) {
    //var text = document.getElementsByTagName('textarea')[0];
    function resize () {
        element.style.height = 'auto';
        element.style.height = element.scrollHeight+'px';
    }
    /* 0-timeout to get the already changed text */
    function delayedResize () {
        window.setTimeout(resize, 0);
    }
    observe(element, 'change',  resize);
    observe(element, 'cut',     delayedResize);
    observe(element, 'paste',   delayedResize);
    observe(element, 'drop',    delayedResize);
    observe(element, 'keydown', delayedResize);

    element.focus();
    element.select();
    resize();
}