// Global variables
var isCSS, isW3C, isIE4, isNN4, isIE6CSS, canDisplay = 0;

// Initialize upon load to let all browsers establish content objects
function initDHTMLAPI() {
    if (document.images) {
        isCSS = (document.body && document.body.style) ? true : false;
        isW3C = (isCSS && document.getElementById) ? true : false;
        isIE4 = (isCSS && document.all) ? true : false;
        isNN4 = (document.layers) ? true : false;
        isIE6CSS = (document.compatMode && document.compatMode.indexOf("CSS1") >= 0) ? true : false;
    }
}
// Set event handler to initialize API
window.onload = initDHTMLAPI;

// Seek nested NN4 layer from string name
function seekLayer(doc, name) {
    var theObj;
    for (var i = 0; i < doc.layers.length; i++) {
        if (doc.layers[i].name == name) {
            theObj = doc.layers[i];
            break;
        }
        // dive into nested layers if necessary
        if (doc.layers[i].document.layers.length > 0) {
            theObj = seekLayer(document.layers[i].document, name);
        }
    }
    return theObj;
}

// Convert object name string or object reference
// into a valid element object reference
function getRawObject(obj) {
    var theObj;
    if (typeof obj == "string") {
        if (isW3C) {
            theObj = document.getElementById(obj);
        } else if (isIE4) {
            theObj = document.all(obj);
        } else if (isNN4) {
            theObj = seekLayer(document, obj);
        }
    } else {
        // pass through object reference
        theObj = obj;
    }
    return theObj;
}

// Convert object name string or object reference
// into a valid style (or NN4 layer) reference
function getObject(obj) {
    var theObj = getRawObject(obj);
    if (theObj && isCSS) {
        theObj = theObj.style;
    }
    return theObj;
}

// Position an object at a specific pixel coordinate
function shiftTo(obj, x, y) {
    var theObj = getObject(obj);
    if (theObj) {
        if (isCSS) {
            // equalize incorrect numeric value type
            var units = (typeof theObj.left == "string") ? "px" : 0 
            theObj.left = x + units;
            theObj.top = y + units;
        } else if (isNN4) {
            theObj.moveTo(x,y)
        }
    }
}

// Move an object by x and/or y pixels
function shiftBy(obj, deltaX, deltaY) {
    var theObj = getObject(obj);
    if (theObj) {
        if (isCSS) {
            // equalize incorrect numeric value type
            var units = (typeof theObj.left == "string") ? "px" : 0 
            theObj.left = getObjectLeft(obj) + deltaX + units;
            theObj.top = getObjectTop(obj) + deltaY + units;
        } else if (isNN4) {
            theObj.moveBy(deltaX, deltaY);
        }
    }
}

// Set the z-order of an object
function setZIndex(obj, zOrder) {
    var theObj = getObject(obj);
    if (theObj) {
        theObj.zIndex = zOrder;
    }
}

// Set the background color of an object
function setBGColor(obj, color) {
    var theObj = getObject(obj);
    if (theObj) {
        if (isNN4) {
            theObj.bgColor = color;
        } else if (isCSS) {
            theObj.backgroundColor = color;
        }
    }
}

// Set the visibility of an object to visible
function show(obj) {
    var theObj = getObject(obj);
    if (theObj) {
        theObj.visibility = "visible";
    }
}

// Set the visibility of an object to hidden
function hide(obj) {
    var theObj = getObject(obj);
    if (theObj) {
        theObj.visibility = "hidden";
    }
}

// Retrieve the x coordinate of a positionable object
function getObjectLeft(obj)  {
    var elem = getRawObject(obj);
    var result = 0;
    if (document.defaultView) {
        var style = document.defaultView;
        var cssDecl = style.getComputedStyle(elem, "");
        result = cssDecl.getPropertyValue("left");
    } else if (elem.currentStyle) {
        result = elem.currentStyle.left;
    } else if (elem.style) {
        result = elem.style.left;
    } else if (isNN4) {
        result = elem.left;
    }
    return parseInt(result);
}

// Retrieve the y coordinate of a positionable object
function getObjectTop(obj)  {
    var elem = getRawObject(obj);
    var result = 0;
    if (document.defaultView) {
        var style = document.defaultView;
        var cssDecl = style.getComputedStyle(elem, "");
        result = cssDecl.getPropertyValue("top");
    } else if (elem.currentStyle) {
        result = elem.currentStyle.top;
    } else if (elem.style) {
        result = elem.style.top;
    } else if (isNN4) {
        result = elem.top;
    }
    return parseInt(result);
}

// Retrieve the rendered width of an element
function getObjectWidth(obj)  {
    var elem = getRawObject(obj);
    var result = 0;
    if (elem.offsetWidth) {
        result = elem.offsetWidth;
    } else if (elem.clip && elem.clip.width) {
        result = elem.clip.width;
    } else if (elem.style && elem.style.pixelWidth) {
        result = elem.style.pixelWidth;
    }
    return parseInt(result);
}

// Retrieve the rendered height of an element
function getObjectHeight(obj)  {
    var elem = getRawObject(obj);
    var result = 0;
    if (elem.offsetHeight) {
        result = elem.offsetHeight;
    } else if (elem.clip && elem.clip.height) {
        result = elem.clip.height;
    } else if (elem.style && elem.style.pixelHeight) {
        result = elem.style.pixelHeight;
    }
    return parseInt(result);
}

// Return the available content width space in browser window
function getInsideWindowWidth() {
    if (window.innerWidth) {
        return window.innerWidth;
    } else if (isIE6CSS) {
        // measure the html element's clientWidth
        return document.body.parentElement.clientWidth
    } else if (document.body && document.body.clientWidth) {
        return document.body.clientWidth;
    }
    return 0;
}

// Return the available content height space in browser window
function getInsideWindowHeight() {
    if (window.innerHeight) {
        return window.innerHeight;
    } else if (isIE6CSS) {
        // measure the html element's clientHeight
        return document.body.parentElement.clientHeight
    } else if (document.body && document.body.clientHeight) {
        return document.body.clientHeight;
    }
    return 0;
}

// Center a positionable element whose name is passed as 
// a parameter in the current window/frame, and show it
function centerOnWindow(elemID) {
    // 'obj' is the positionable object
    var obj = getRawObject(elemID);
    // window scroll factors
    var scrollX = 0, scrollY = 0;
    if (document.body && typeof document.body.scrollTop != "undefined") {
        scrollX += document.body.scrollLeft;
        scrollY += document.body.scrollTop;
        if (document.body.parentNode && typeof document.body.parentNode.scrollTop != "undefined") {
            scrollX += document.body.parentNode.scrollLeft;
            scrollY += document.body.parentNode.scrollTop;
        }
    }
    else if (typeof window.pageXOffset != "undefined") {
        scrollX += window.pageXOffset;
        scrollY += window.pageYOffset;
    }
    
    var x = Math.round((getInsideWindowWidth() /2) - (getObjectWidth(obj) /2)) + scrollX;
    var y = Math.round((getInsideWindowHeight()/2) - (getObjectHeight(obj)/2)) + scrollY;

    shiftTo(obj, x, y);
    show(obj);
}

function initProgressBar() {
    // create quirks object whose default (CSS-compatible) values
    // are zero; pertinent values for quirks mode filled in later 
    if (navigator.appName == "Microsoft Internet Explorer" && 
        navigator.userAgent.indexOf("Win") != -1 &&
        (typeof document.compatMode == "undefined" || document.compatMode == "BackCompat")) {
        
        document.getElementById("progressBarShim").style.height = "81px";
        document.getElementById("progressBarShim").style.width  = "344px";

        document.getElementById("progressBar").style.height = "81px";
        document.getElementById("progressBar").style.width  = "344px";
        document.getElementById("slider").style.fontSize    = "xx-small";
        document.getElementById("slider").style.height      = "13px";
        document.getElementById("slider").style.width       = "415px";
    }
}

function showProgressBar(barMsg) {
    if (barMsg) document.getElementById("progressBarMsg").firstChild.nodeValue = barMsg;
    centerOnWindow("progressBarShim");
    centerOnWindow("progressBar");

    loopObject.current   = 0;
    loopObject.direction = 1;
}

function calcProgress(current) {
    var right = current;
    var left  = right - loopObject.fbWidth;
    if (left  < loopObject.start) left  = loopObject.start;
    if (right > loopObject.end  ) right = loopObject.end;
    
    document.getElementById("slider").style.clip = "rect(0px " + right + "px 16px " + left + "px)";
    
    if (right <= loopObject.start && loopObject.direction < 0) {
        loopObject.direction = 1;
    }
    else if (left >= loopObject.end && loopObject.direction > 0) {
        loopObject.direction = -1;
    }
}

function hideProgressBar() {
    if (typeof parent != 'undefined' && parent != this) {
        if (typeof parent.hideProgressBar != 'undefined') {
            parent.hideProgressBar();
        }

        return;
    }

    hide("progressBar");
    hide("progressBarShim");

    loopObject.current   = 0;
    loopObject.direction = 0;
    canDisplay=0;
}

// Test bench to see progress bar in action at random intervals
var loopObject = {start:0, end:317, current:0, interval:null, direction:1,  fbWidth: 32 };

function runit() {
    if (loopObject.direction != 0) {
        calcProgress(loopObject.current, loopObject.end);
        loopObject.current += loopObject.direction;
        loopObject.interval = setTimeout("runit()", 10);
    }
}

function startProgressBar(barMsg) {
    if (canDisplay == 1) {
        showProgressBar(barMsg);
        runit();
    }
}

function displayProgress(barMsg) {
    if (typeof parent != 'undefined' && parent != this) {
        if (typeof parent.displayProgress != 'undefined') {
            parent.displayProgress(barMsg);
        }

        return;
    }

    if (barMsg) {
        setTimeout("startProgressBar('" + barMsg + "')", 2000);
    }
    else {
        setTimeout("startProgressBar()", 2000);
    }
    canDisplay=1;
}

function k_dp() {
	displayProgress();
}