.ShowMe{display:block;}
function(url)
{
document.getElementById('myIFrame').src = url;
document.getElementById('myIFrame').className = ShowMe;
}
<script type="javascript">
var iframe = document.createElement("myIFrame");
iframe.src = url;
if (navigator.userAgent.indexOf("MSIE") > -1 && !window.opera){
iframe.onreadystatechange = function(){
if (iframe.readyState == "complete"){
//not sure if your code works but it is below for reference
document.getElementById('myIFrame').class = ShowMe;
//or this which will work
//document.getElementById("myIFrame").className = "ShowMe";
}
};
}
else
{
iframe.onload = function(){
//not sure if your code works but it is below for reference
document.getElementById('myIFrame').class = ShowMe;
//or this which will work
//document.getElementById("myIFrame").className = "ShowMe";
};
}
</script>
window.onload = function () {
window.frameElement.className = 'ShowMe'; // 'ShowMe' or what ever you have in ShowMe variable.
}