function showElement(id) {
document.getElementById(id).style.visibility = 'visible';
};

function hideElement(id) {
document.getElementById(id).style.visibility = 'hidden';
};

function liveElement(id) {
document.getElementById(id).style.display = 'block';
};

function killElement(id) {
document.getElementById(id).style.display = 'none';
};

function onoffElement(id) {
document.getElementById(id).style.visibility = (document.getElementById(id).style.visibility == 'hidden' || !document.getElementById(id).style.visibility) ? 'visible' : 'hidden';

};

function containsDOM (container, containee) {
var isParent = false;
do {
if ((isParent = container == containee))
break;
containee = containee.parentNode;
}
while (containee != null);
return isParent;
};

function checkMouseEnter (element, evt) {
if (element.contains && evt.fromElement) {
return !element.contains(evt.fromElement);
}
else if (evt.relatedTarget) {
return !containsDOM(element, evt.relatedTarget);
}};

function checkMouseLeave (element, evt) {
if (element.contains && evt.toElement) {
return !element.contains(evt.toElement);
}
else if (evt.relatedTarget) {
return !containsDOM(element, evt.relatedTarget);
}};