function insert_emoticon(txtName, emoticon) { 
    var txtObj = eval("document.forms[0]." + txtName); 
    if(txtObj.createTextRange && txtObj.caretPos) { 
        txtObj.caretPos.text = emoticon; 
        txtObj.focus(); 
    } 
}
function markSelection(txtObj) { 
    if(txtObj.createTextRange) { 
        txtObj.caretPos = document.selection.createRange().duplicate(); 
        isSelected = true; 
    } 
}