После $BODY$ <script>
function b_tag_url(){
var FoundErrors = '';
var enterURL = prompt(text_enter_url, "http://");
var enterTITLE = prompt(text_enter_url_name, "Стукни сюда, сабака!");
if (!enterURL || enterURL=='http://') {FoundErrors = 1;}
else if (!enterTITLE) {FoundErrors = 1;}
if (FoundErrors) {return;}
b_doInsert("[url="+enterURL+"]"+enterTITLE+"[/url]", "", false);
}
</script>