// 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("progressBar").style.height = "81px";
        document.getElementById("progressBar").style.width = "444px";
        document.getElementById("sliderWrapper").style.fontSize = "xx-small";
        document.getElementById("slider").style.fontSize = "xx-small";
        document.getElementById("slider").style.height = "13px";
        document.getElementById("slider").style.width = "415px";
    }
}

function showProgressBar() {
    centerOnWindow("progressBar");
}

function calcProgress(current, total) {
    if (current <= total) {
        var factor = current/total;
        var pct = Math.ceil(factor * 100);
        document.getElementById("sliderWrapper").firstChild.nodeValue = pct + "%";
        document.getElementById("slider").firstChild.nodeValue = pct + "%";
        document.getElementById("slider").style.clip = "rect(0px " + parseInt(factor * 417) + "px 16px 0px)";
    }
}

function hideProgressBar() {
    hide("progressBar");
    calcProgress(0, 0);
}

// Test bench to see progress bar in action at random intervals
var loopObject = {start:0, end:10, current:0, interval:null};

function runit() {
    if (loopObject.current <= loopObject.end) {
        calcProgress(loopObject.current, loopObject.end);
        loopObject.current += Math.random();
        loopObject.interval = setTimeout("runit()", 700);
    } else {
        calcProgress(loopObject.end, loopObject.end);
        loopObject.current = 0;
        loopObject.interval = null;
        setTimeout("hideProgressBar()", 500);
    }
}

function test() {
    showProgressBar();
    runit();
}