function disableEnterKey(e)
{
     var key;

     if(window.event)
          key = window.event.keyCode;     //IE
     else
          key = e.which;     //firefox

     if(key == 13)
          return false;
     else
          return true;
}

function insertAtCursor(myField, mytag) {
  //IE support
  if (document.selection) {
    myField.focus();
    sel = document.selection.createRange();
    sel.text = "["+mytag+"]"+sel.text+"[/"+mytag+"]";
  }
  //MOZILLA/NETSCAPE support
  else if (myField.selectionStart || myField.selectionStart == "0") {
    var startPos = myField.selectionStart;
    var endPos = myField.selectionEnd;
    myField.value = myField.value.substring(0, startPos)
                  + "["+mytag+"]" 
                  + myField.value.substring(startPos, endPos)
                  + "[/"+mytag+"]" 
                  + myField.value.substring(endPos, myField.value.length);
  } else {
    myField.value += myValue;
  }
    myField.focus();
 }