Hướng dẫn cài đặt JavaScript BBcode Toolbar - Công cụ viết BBcode nhanh cho Form

<script type="text/javascript">

  function tag(text1,text2){

    if((document.selection)){

      document.form.msg.focus();

      document.form.document.selection.createRange().text = text1+document.form.document.selection.createRange().text+text2

    }else if(document.forms['form'].elements['msg'].selectionStart!=undefined){

      var element=document.forms['form'].elements['msg'];

      var str=element.value;

      var start=element.selectionStart;

      var length=element.selectionEnd-element.selectionStart;

      element.value=str.substr(0,start)+text1+str.substr(start,length)+text2+str.substr(start+length)

    }else{

      document.form.msg.value+=text1+text2

    }

  };

  function show_hide(a){

    b=document.getElementById(a);

    if(b.style.display=="none"){

      b.style.display="block"

    }else{

      b.style.display="none"

    }

  }

</script>