下面这样不知道错在哪?
document.writeln("<script type="text/javascript"><!--"

;
document.writeln("google_ad_client = "******";"

;
document.writeln("google_ad_width = 468;"

;
document.writeln("google_ad_height = 60;");
document.writeln("google_ad_format = "468x60_as";");
document.writeln("google_ad_type = "text";");
document.writeln("//channel ");
document.writeln("google_ad_channel = "*****";");
document.writeln("//--></script>");
document.writeln("<script type="text/javascript"");
document.writeln("src="http://pagead2.googlesyndication.com/pagead/show_ads.js">");
document.writeln("</script>");
望指出!或给出个其他的.