var script = document.createElement('script')
script.type = "text/javascript"
script.src = "//ajax.googleapis.com/ajax/libs/swfobject/2.2/swfobject.js"
document.head.appendChild(script)
var url = "http://bs.ru/banners/12/ren_cc_240x400.swf"
i = 0
domreadyinterval = setInterval((function(){
if( !( document && document.getElementsByTagName && document.getElementById && document.body ) )
{
i++
} else {
document.getElementById('leads24').innerHTML = "<script type='text/javascript'>swfobject.embedSWF( '" + url + "' , 'container' , '240' , '400' , '9.0.0' )</script>hello"
clearInterval(domreadyinterval)
alert(i)
}
}),1)
<html>
<head></head>
<body>
<script type="text/javascript" src="http://bs.ru/getbanner.php?uid=1&pid=2&bid=3&channel=tk"></script>
<div id="leads24"></div>
</body>
</html>