//onKeyDown of textbox.
function keyDown(event,buttonID) {
    if (event!=null?event.keyCode == 13:false) {
        var btt = document.getElementById(buttonID);
        btt.click();
        event.cancelBubble = true;
        if (event.stopPropagation) event.stopPropagation();
        return false;
    }
}