var SubmitFormDefaultButton = "";

function SetSubmitFormDefaultButton(event, ButtonID) {
    if (event.keyCode == 13) {
        SubmitFormDefaultButton = ButtonID;
    }
    else {
        SubmitFormDefaultButton = "";
    }
}

function WebFormFireDefaultButton(event) {
    if (event.keyCode == 13) {
        if (SubmitFormDefaultButton != "") {
            var src = event.srcElement || event.target;
            if (!src || (src.tagName.toLowerCase() != "textarea")) {
                var defaultButton;
                defaultButton = document.getElementById(SubmitFormDefaultButton);
                if (defaultButton && typeof (defaultButton.click) != "undefined") {
                    defaultButton.click();
                    event.cancelBubble = true;
                    if (event.stopPropagation) event.stopPropagation();
                    return false;
                }
            }
        }
    }
    return true;
}