// to show dynamic errors
function showError(msg){
    var ctrl = document.getElementById("error");
    if (msg.length> 0)
        ctrl.innerHTML='<table cellspacing="4" cellpadding="2" border="0" width="100%" class="warning"><tr><td class="warning">' + msg + '</td></tr></table>';
    else if (ctrl && ctrl.innerHTML.length != 0)
        ctrl.innerHTML="";
}