function addLoadListener(fn) {
	if (typeof window.addEventListener != 'undefined') {
		window.addEventListener('load', fn, false);
	}
	else if (typeof document.addEventListener != 'undefined') {
		document.addEventListener('load', fn, false);
	}
	else if (typeof window.attachEvent != 'undefined') {
		window.attachEvent('onload', fn);
	}
	else {
		return false;
	}
	return true;
};

function attachEventListener(target, eventType, functionRef, capture) {
	if (!document.getElementById) return false;
    if (typeof target.addEventListener != "undefined") {
        target.addEventListener(eventType, functionRef, capture);
    }
    else if (typeof target.attachEvent != "undefined") {
        target.attachEvent("on" + eventType, functionRef);
    }
    else {
        return false;
    }
    return true;
};


function EnableKey(e,keys)
{
    if(navigator.appName == "Netscape")
        return (( e.charCode != 0 && keys.indexOf(String.fromCharCode(e.charCode)) == -1)?false:true);
    else
        if(keys.indexOf(String.fromCharCode(e.keyCode)) == -1) event.keyCode = null;
};