var DHTML = false, DOM = false, MSIE4 = false, NS4 = false, OP = false;


if (document.getElementById) {
    DHTML = true;
    DOM   = true;
} else {
    if (document.all) {
        DHTML = true;
        MSIE4 = true;
    } else if (document.layers) {
        DHTML = true;
        NS4 = true;
    }
}
if (window.opera) {
    OP = true;
}


function getElement(Mode, Identifier, ElementNumber)
{
    var Element;
    if (DOM) {
        if (Mode.toLowerCase() == "id") {
            if (typeof document.getElementById(Identifier) == "object") {
                Element = document.getElementById(Identifier);
            } else {
                Element = false;
            }
            return Element;
        }
        if (Mode.toLowerCase() == "name") {
            var ElementList = document.getElementsByName(Identifier);
            if (typeof ElementList == "object" || (OP && typeof ElementList == "function")) {
                Element = ElementList[ElementNumber];
            } else {
                Element = false;
            }
            return Element;
        }
        if (Mode.toLowerCase() == "tagname") {
            var ElementList = document.getElementsByTagName(Identifier);
            if (typeof ElementList == "object" || (OP && typeof ElementList == "function")) {
                Element = ElementList[ElementNumber];
            } else {
                Element = false;
            }
            return Element;
        }
        return null;
    }
    // no DOM
    if (MSIE4) {
        if (Mode.toLowerCase() == "id") {
            if (typeof document.all[Identifier] == "object") {
                Element = document.all[Identifier];
            } else {
                Element = false;
            }
            return Element;
        }
        if (Mode.toLowerCase() == "tagname") {
            if (typeof document.all.tags(Identifier) == "object") {
                Element = document.all.tags(Identifier)[ElementNumber];
            } else {
                Element = false;
            }
            return Element;
        }
        if (Mode.toLowerCase() == "name") {
            if (typeof document[Identifier] == "object") {
                Element = document[Identifier];
            } else {
                Element = false;
            }
            return Element;
        }
        return false;
    }
    if (NS4) {
        if (Mode.toLowerCase() == "id" || Mode.toLowerCase() == "name") {
            if (typeof document[Identifier] == "object") {
                Element = document[Identifier];
            } else {
                Element = false;
            }
            return Element;
        }
        if (Mode.toLowerCase() == "index") {
            if (typeof document.layers[Identifier] == "object") {
                Element = document.layers[Identifier];
            } else {
                Element = false;
            }
            return Element;
        }
        return false;
    }
    return false;
}


function getContent(Mode, Identifier, ElementNumber)
{
    var Content;
    var Element = getElement(Mode, Identifier, ElementNumber);
    if (!Element) {
        return false;
    }
    if (DOM && Element.firstChild) {
        if (Element.firstChild.nodeType == 3) {
            Content = Element.firstChild.nodeValue;
        } else {
            Content = "";
        }
        return Content;
    }
    if (MSIE4) {
        Content = Element.innerText;
        return Content;
    }
    return false;
}


function getAttribute(Mode, Identifier, ElementNumber, AttributeName)
{
    var Attribute;
    var Element = getElement(Mode, Identifier, ElementNumber);
    if (!Element) {
        return false;
    }
    if (DOM || MSIE4) {
        Attribute = Element.getAttribute(AttributeName);
        return Attribute;
    }
    if (NS4) {
        if (typeof Element[ElementNumber] == "object") {
            Attribute = Element[ElementNumber][AttributeName];
        } else {
            Attribute = Element[AttributeName]
                }
        return Attribute;
    }
    return false;
}


function setContent(Mode, Identifier, ElementNumber, Text)
{
    var Element = getElement(Mode, Identifier, ElementNumber);
    if (!Element) {
        return false;
    }
    if (DOM && Element.firstChild) {
        Element.firstChild.nodeValue = Text;
        return true;
    }
    if (MSIE4) {
        Element.innerText = Text;
        return true;
    }
    if (NS4) {
        Element.document.open();
        Element.document.write(Text);
        Element.document.close();
        return true;
    }
}


function setMouseMoveHandler(node, fn)
{
    if (node.addEventListener) {
        node.addEventListener('mousemove', fn, true);
    } else {
        if (NS4) {
            node.captureEvents(Event.MOUSEMOVE);
            node.onmousemove = fn;
        } else {
            node.body.onmousemove = fn;
        }
    }
}

function delMouseMoveHandler(node, fn)
{
    if (node.addEventListener) {
        node.removeEventListener('mousemove', fn, true);
    } else {
        if (NS4) {
            node.releaseEvents(Event.MOUSEMOVE);
            node.onmousemove = null;
        } else {
            node.body.onmousemove = null;
        }
    }
}