document.getElementById('newzWidget200x200').style.width = "200px";
document.getElementById('newzWidget200x200').style.height = "200px";

var toWrite = '<iframe src ="http://www.newz.ro/widget/200x200.html" marginheight="0" marginwidth="0" scrolling="no" frameborder="0" style="background: #036499; width: 200px; height: 200px"></iframe>';

document.getElementById('newzWidget200x200').innerHTML = toWrite;