A basic JavaScript console window for browsers that don't support the console object

Simple JavaScript console

if (!window.console) {
    window.onload = function() {
        var txt = document.createElement('textarea');
        txt.style.position = 'absolute';
        txt.style.top = '0px';
        txt.style.left = '0px';
        txt.style.height = '800px';
        txt.style.width = '500px';
        txt.id = 'console';
        document.body.appendChild(txt);

        var btn = document.createElement('input');
        btn.type = 'button';
        btn.value = 'run';
        btn.style.position = 'absolute';
        btn.style.top = '800px';
        btn.style.left = '0px';
        btn.style.width = '50px';
        btn.onclick = function() {
            console.log(eval(txt.value));
        };
        document.body.appendChild(btn);

    };
    console = {};
    console.log = function(txt) {
        var c = document.getElementById('console');
        c.value += (txt || '') + '\n';
    }
}