sf = function() {
	if (arguments.length == 0)
		return "";
	if (arguments.length == 1)
		return arguments[0];
	var reg = /{(\d+)?}/g;
	var args = arguments;
	var result = arguments[0].replace(reg, function($0, $1) {
		return args[parseInt($1) + 1];
	})
	return result;
}

function getKeywords() {
	var meta_keywords = '';
	var objMeta = document.getElementsByTagName('meta');
	if (objMeta && objMeta.length) {
		for (var j = 0; j < objMeta.length; j++) {
			if (objMeta[j].name.toLowerCase() == 'keywords') {
				meta_keywords = objMeta[j].content;
			}
		}
	}
	return meta_keywords;
}

function getCharset() {
	if (document.charset)
		return document.charset;
	if (document.characterSet)
		return document.characterSet;
}
document.write(sf('<iframe width="{0}"  height="{1}"  src="http://adserve.tom.com/ads/ad.html?w={0}&h={1}&pid={2}&def={3}&key={4}&charset={5}"  style="display:inline"  align="center,center"  marginwidth=0  marginheight=0  scrolling=no  frameborder=0 allowtransparency></iframe>',750, 80, 2123, 'http://data.adserve.tomoimg.cn/addata/html/ad_2123.html', getKeywords(),getCharset()))