if (window.attachEvent) {
    window.attachEvent('onload', startCreateAD);
}
else {
    window.addEventListener('load', startCreateAD, false);
}

function startCreateAD(){
	var DIVs = document.getElementsByTagName('div');
	var temp_container;
	for (var i in DIVs) {
		if(DIVs[i].className == 'blogbody'){
			temp_container = DIVs[i].innerHTML;
			DIVs[i].innerHTML = ad_content+temp_container;
			break;
		}
	}
}