function clickButton(e, buttonid) {
   
    var bt = document.getElementById(buttonid);
    if (typeof bt == 'object') {
        if (navigator.appName.indexOf("Netscape") > (-1)) {
            if (e.keyCode == 13) {
                if (bt && typeof (bt.click) == 'undefined') {
                    bt.click = addClickFunction1(bt)
                }
            }
        }       
        if (navigator.appName.indexOf("Microsoft Internet Explorer") > (-1)) {
            if (event.keyCode == 13) {
                bt.click();
                return false;
            }
        }
    }
}


function addClickFunction1(bt) {
    
    var result = true;
    if (bt.onclick) result = bt.onclick();
    if (typeof (result) == 'undefined' || result) {
        eval(bt.href);
    }
}