Reload iframe - Javascript

HTML

<iframe id="iframeid" src="https://maps.google.com/maps?f=q&amp;source=s_q&amp;hl=en&amp;geocode=&amp;q=eiffel+tower&amp;aq=&amp;sll=41.228249,-80.661621&amp;sspn=11.149099,23.269043&amp;ie=UTF8&amp;hq=&amp;hnear=Eiffel+Tower,+5+Avenue+Anatole+France,+75007+Paris,+%C3%8Ele-de-France,+France&amp;t=h&amp;ll=48.858186,2.294512&amp;spn=0.002471,0.00456&amp;z=17&amp;output=embed"></iframe>
<input type="button" id="btn" value="refresh" />

CSS

iframe {
    width: 420px;
    height: 350px;
    border: 0;
    overflow: hidden;
}

JavaScript

function reload() {
    document.getElementById('iframeid').src += '';
} btn.onclick = reload;