function paste(t1,t2)
{
	var textBox = eval('document.PageForm._ctl0__ctl0__ctl0_txtMessage');
	if (true) {
		if (document.selection) {
			textBox.focus();

			var txt = textBox.value;
			var str = document.selection.createRange();

			if (str.text == "") {
				str.text = t1 + t2;
			} else if (txt.indexOf(str.text)>= 0 ) {
				str.text = t1 + str.text + t2;
			} else {
				textBox.value = txt + t1 + t2;
			}
		}
	} else {
		textBox.value = 
		textBox.value + t1 + t2;
	}
}

onclick="javascript:paste('[strong]','[/strong]')"

function InsertCode(codes, codee) {
  document.msgform.message.focus();
  
  if (document.selection) {
    // ie & may be opera  8 
    var rng = document.selection.createRange();
    if (rng.text) {   
      document.selection.createRange().text = codes + rng.text + codee;
    } else {  
      document.msgform.message.value += codes  + codee;
    }
    document.msgform.message.focus();
  } else if (document.msgform.message.selectionStart ||
document.msgform.message.selectionStart == '0') {
    // mozilla: intellegent bcodes support
    var selStart = document.msgform.message.selectionStart;
    var selEnd = document.msgform.message.selectionEnd;

    var s = document.msgform.message.value;
    s = s.substring( 0 , selStart) + codes + s.substring(selStart, selEnd)
+ codee + s.substring(selEnd, s.length);
    document.msgform.message.value = s;

    if (selEnd != selStart) {
      document.msgform.message.selectionStart = selStart;
      document.msgform.message.selectionEnd = selEnd + codes.length +
codee.length;
    } else {
      document.msgform.message.selectionStart = selStart + codes.length;
      document.msgform.message.selectionEnd =
document.msgform.message.selectionStart;
    }
  } else {
    // other browsers
    document.msgform.message.value += codes + codee;
  }
}

onclick="InsertCode('','')"