
 //<![CDATA[

    //*****************************************************************************
    // Do not remove this notice.
    //
    // Copyright 2001 by Mike Hall.
    // See http://www.brainjar.com for terms of use.
    //*****************************************************************************

    // Determine browser and version.

    function Browser() {

        var ua, s, i;

        this.isIE = false;
        this.isNS = false;
        this.version = null;

        ua = navigator.userAgent;

        s = "MSIE";
        if ((i = ua.indexOf(s)) >= 0) {
            this.isIE = true;
            this.version = parseFloat(ua.substr(i + s.length));
            return;
        }

        s = "Netscape6/";
        if ((i = ua.indexOf(s)) >= 0) {
            this.isNS = true;
            this.version = parseFloat(ua.substr(i + s.length));
            return;
        }

        // Treat any other "Gecko" browser as NS 6.1.

        s = "Gecko";
        if ((i = ua.indexOf(s)) >= 0) {
            this.isNS = true;
            this.version = 6.1;
            return;
        }
    }

   var browser = new Browser();

    // Global object to hold drag information.

    var dragObj = new Object();
    dragObj.zIndex = 0;

    function dragStart(event, id) {

        var el;
        var x, y;

        // If an element id was given, find it. Otherwise use the element being
        // clicked on.

        if (id)
            dragObj.elNode = document.getElementById(id);
        else {
            if (browser.isIE)
                dragObj.elNode = window.event.srcElement;
            if (browser.isNS)
                dragObj.elNode = event.target;

            // If this is a text node, use its parent element.

            if (dragObj.elNode.nodeType == 3)
                dragObj.elNode = dragObj.elNode.parentNode;
        }

        // Get cursor position with respect to the page.

        if (browser.isIE) {
            x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
            y = window.event.clientY + document.documentElement.scrollTop
      + document.body.scrollTop;
        }
        if (browser.isNS) {
            x = event.clientX + window.scrollX;
            y = event.clientY + window.scrollY;
        }

        // Save starting positions of cursor and element.

        dragObj.cursorStartX = x;
        dragObj.cursorStartY = y;
        dragObj.elStartLeft = parseInt(dragObj.elNode.style.left, 10);
        dragObj.elStartTop = parseInt(dragObj.elNode.style.top, 10);

        if (isNaN(dragObj.elStartLeft)) dragObj.elStartLeft = 0;
        if (isNaN(dragObj.elStartTop)) dragObj.elStartTop = 0;

        // Update element's z-index.

        dragObj.elNode.style.zIndex = ++dragObj.zIndex;

        // Capture mousemove and mouseup events on the page.

        if (browser.isIE) {
            document.attachEvent("onmousemove", dragGo);
            document.attachEvent("onmouseup", dragStop);
            window.event.cancelBubble = true;
            window.event.returnValue = false;
        }
        if (browser.isNS) {
            document.addEventListener("mousemove", dragGo, true);
            document.addEventListener("mouseup", dragStop, true);
            event.preventDefault();
        }
    }

    function dragGo(event) {

        var x, y;

        // Get cursor position with respect to the page.

        if (browser.isIE) {
            x = window.event.clientX + document.documentElement.scrollLeft
      + document.body.scrollLeft;
            y = window.event.clientY + document.documentElement.scrollTop
      + document.body.scrollTop;
        }
        if (browser.isNS) {
            x = event.clientX + window.scrollX;
            y = event.clientY + window.scrollY;
        }

        // Move drag element by the same amount the cursor has moved.

        dragObj.elNode.style.left = (dragObj.elStartLeft + x - dragObj.cursorStartX) + "px";
        dragObj.elNode.style.top = (dragObj.elStartTop + y - dragObj.cursorStartY) + "px";

        if (browser.isIE) {
            window.event.cancelBubble = true;
            window.event.returnValue = false;
        }
        if (browser.isNS)
            event.preventDefault();
    }

    function dragStop(event) {

        // Stop capturing mousemove and mouseup events.

        if (browser.isIE) {
            document.detachEvent("onmousemove", dragGo);
            document.detachEvent("onmouseup", dragStop);
        }
        if (browser.isNS) {
            document.removeEventListener("mousemove", dragGo, true);
            document.removeEventListener("mouseup", dragStop, true);
        }
    }

    //]]>