document.getElementById('newzWidget180x400').style.width = "180px";
document.getElementById('newzWidget180x400').style.height = "400px";

var toWrite = '<iframe src ="http://www.newz.ro/widget/180x400.html" marginheight="0" marginwidth="0" scrolling="no" frameborder="0" style="background: #036499; width: 180px; height: 400px"></iframe>';

document.getElementById('newzWidget180x400').innerHTML = toWrite;