BB Code Client's Side - how to make url and email

I have text area for user to write article. For user I use this javascript I found from Google search :


<script type="text/javascript">
function getSelection(ta)
  { var bits = [ta.value,'','','']; 
    if(document.selection)
      { var vs = '#$%^%$#';
        var tr=document.selection.createRange()
        if(tr.parentElement()!=ta) return null;
        bits[2] = tr.text;
        tr.text = vs;
        fb = ta.value.split(vs);
        tr.moveStart('character',-vs.length);
        tr.text = bits[2];
        bits[1] = fb[0];
        bits[3] = fb[1];
      }
    else
      { if(ta.selectionStart == ta.selectionEnd) return null;
        bits=(new RegExp('([\x00-\xff]{'+ta.selectionStart+'})([\x00-\xff]{'+(ta.selectionEnd - ta.selectionStart)+'})([\x00-\xff]*)')).exec(ta.value);
      }
     return bits;
  }

function matchPTags(str)
  { str = ' ' + str + ' ';
    ot = str.split(/\[[b|u|i|url].*?\]/i);
    ct = str.split(/\[\/[b|u|i|url].*?\]/i);
    return ot.length==ct.length;
  }

function addPTag(ta,pTag)
  { bits = getSelection(ta);
    if(bits)
      { if(!matchPTags(bits[2]))
          { alert('		Invalid Selection
Selection contains unmatched opening or closing tags.');
            return;
          }
        ta.value = bits[1] + '[' + pTag + ']' + bits[2] + '[/' + pTag + ']' + bits[3];
      }
  }

function bbUrl(){
document.test_form.test_textarea.value+="["+prompt("Text of link:")+"](+prompt("URL:")+)"
}


</script>


Above the textarea, here’s the code :


<fieldset>
<button onclick="addPTag(document.getElementById('text'),'b')"><b>Bold</b></button>
<button onclick="addPTag(document.getElementById('text'),'i')"><i>Italic</i></button>
<button onclick="addPTag(document.getElementById('text'),'u')"><u>Underline</u></button>
<button onclick="addPTag(document.getElementById('text'),'url')"><url>URL</url></button>

</fieldset>

All the entry posted via this client side then are parsed with BB Code function. All works well.

What I want is :

  1. How to create popup window when user click on the URL button to ask the title and the link.( exactly the way BB Code in this dear Kirupa Forum works) - so the result will look like this :
<a href="my_link">title
</a>
  1. I’d like to ask the same thing for email link.

I don’t mind if the suggestion you will give me is to use different Javascript than above.

Thanks a lot