easy, firefox way

to block http://*/RealMedia/*

iframe[width="600" height="250"],
iframe[width="600" height=250],
div[onClick="dismissbox*"],
div[id="dropin"],
object[width="600" height="250"] {
display: none !important;
}

*[href*="la18.tv"],
*[src*="la18.tv"],
*[href*="oascentral.wenxuecity.com"],
*[src*="oascentral.wenxuecity.com"],
*[href*="adserver.wenxuecity.com"],
*[src*="adserver.wenxuecity.com"],
*[href*="/BBSView.php?SubID=health_best"],
*[href*="/RealMedia/"],
*[src*="/RealMedia/"],
*[src*="/advpost/"],
*[href*="/advpost/"],
*[href*="rmxads.com"],
*[src*="rmxads.com"],
*[href*="shopping.com"],
*[src*="shopping.com"],
*[href*="dealtime.com"],
*[src*="dealtime.com"],
*[href*="dealsaving.com"],
*[src*="dealsaving.com"] {
display: none !important;
}