/**************************************************
 * dom-drag.js
 * 09.25.2001
 * www.youngpup.net
 **************************************************/

var DomDrag = {
        obj : null,

        init : function(o, oRoot, minX, maxX, minY, maxY, bSwapHorzRef, bSwapVertRef, fXMapper, fYMapper)
        {



                o.onmousedown        = DomDrag.start;

                o.hmode                        = bSwapHorzRef ? false : true ;
                o.vmode                        = bSwapVertRef ? false : true ;

                o.root = oRoot && oRoot != null ? oRoot : o ;

                if (o.hmode  && isNaN(parseInt(o.root.style.left  ))) o.root.style.left   = "0px";
                if (o.vmode  && isNaN(parseInt(o.root.style.top   ))) o.root.style.top    = "0px";
                if (!o.hmode && isNaN(parseInt(o.root.style.right ))) o.root.style.right  = "0px";
                if (!o.vmode && isNaN(parseInt(o.root.style.bottom))) o.root.style.bottom = "0px";

                o.minX        = typeof minX != 'undefined' ? minX : null;
                o.minY        = typeof minY != 'undefined' ? minY : null;
                o.maxX        = typeof maxX != 'undefined' ? maxX : null;
                o.maxY        = typeof maxY != 'undefined' ? maxY : null;

                o.xMapper = fXMapper ? fXMapper : null;
                o.yMapper = fYMapper ? fYMapper : null;

                o.root.onDragStart        = new Function();
                o.root.onDragEnd        = new Function();
                o.root.onDrag                = new Function();
        },

        start : function(e)
        {
                if (event.srcElement.tagName == "INPUT" | event.srcElement.tagName == "A" | event.srcElement.tagName == "SELECT") {
                        return false;
                }


                var o = DomDrag.obj = this;


                e = DomDrag.fixE(e);
                var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
                var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
                o.root.onDragStart(x, y);

                o.lastMouseX        = e.clientX;
                o.lastMouseY        = e.clientY;

                if (o.hmode) {
                        if (o.minX != null)        o.minMouseX        = e.clientX - x + o.minX;
                        if (o.maxX != null)        o.maxMouseX        = o.minMouseX + o.maxX - o.minX;
                } else {
                        if (o.minX != null) o.maxMouseX = -o.minX + e.clientX + x;
                        if (o.maxX != null) o.minMouseX = -o.maxX + e.clientX + x;
                }

                if (o.vmode) {
                        if (o.minY != null)        o.minMouseY        = e.clientY - y + o.minY;
                        if (o.maxY != null)        o.maxMouseY        = o.minMouseY + o.maxY - o.minY;
                } else {
                        if (o.minY != null) o.maxMouseY = -o.minY + e.clientY + y;
                        if (o.maxY != null) o.minMouseY = -o.maxY + e.clientY + y;
                }

                document.onmousemove        = DomDrag.drag;
                document.onmouseup                = DomDrag.end;

                return false;
        },

        drag : function(e)
        {
                e = DomDrag.fixE(e);
                var o = DomDrag.obj;

                var ey        = e.clientY;
                var ex        = e.clientX;
                var y = parseInt(o.vmode ? o.root.style.top  : o.root.style.bottom);
                var x = parseInt(o.hmode ? o.root.style.left : o.root.style.right );
                var nx, ny;

                if (o.minX != null) ex = o.hmode ? Math.max(ex, o.minMouseX) : Math.min(ex, o.maxMouseX);
                if (o.maxX != null) ex = o.hmode ? Math.min(ex, o.maxMouseX) : Math.max(ex, o.minMouseX);
                if (o.minY != null) ey = o.vmode ? Math.max(ey, o.minMouseY) : Math.min(ey, o.maxMouseY);
                if (o.maxY != null) ey = o.vmode ? Math.min(ey, o.maxMouseY) : Math.max(ey, o.minMouseY);

                nx = x + ((ex - o.lastMouseX) * (o.hmode ? 1 : -1));
                ny = y + ((ey - o.lastMouseY) * (o.vmode ? 1 : -1));

                if (o.xMapper)                nx = o.xMapper(y)
                else if (o.yMapper)        ny = o.yMapper(x)

                DomDrag.obj.root.style[o.hmode ? "left" : "right"] = nx + "px";
                DomDrag.obj.root.style[o.vmode ? "top" : "bottom"] = ny + "px";
                DomDrag.obj.lastMouseX        = ex;
                DomDrag.obj.lastMouseY        = ey;
                DomDrag.obj.root.onDrag(nx, ny, DomDrag.obj);
                return false;
        },

        end : function()
        {
                document.onmousemove = null;
                document.onmouseup   = null;
                DomDrag.obj.root.onDragEnd(        parseInt(DomDrag.obj.root.style[DomDrag.obj.hmode ? "left" : "right"]),
                                                                        parseInt(DomDrag.obj.root.style[DomDrag.obj.vmode ? "top" : "bottom"]), DomDrag.obj);
                DomDrag.obj = null;
        },

        fixE : function(e)
        {
                if (typeof e == 'undefined') e = window.event;
                if (typeof e.layerX == 'undefined') e.layerX = e.offsetX;
                if (typeof e.layerY == 'undefined') e.layerY = e.offsetY;
                return e;
        }
};

/* GETTING MOUSE COORDS */

        var currentX;
        var currentY;
        document.onmousemove = function() {
                currentX = getX();
                currentY = getY();
        }

function getX() {
        return event.clientX+findScrollLeft();
}

function getY() {
        return event.clientY+findScrollTop();
}
function findScrollLeft() {
        if (window.pageXOffset != null)
                return window.pageXOffset;
        if (document.body.scrollHeight != null)
                return document.body.scrollLeft;
        return (null);
}
function findScrollTop() {
        if (window.pageYOffset != null)
                return window.pageYOffset;
        if (document.body.scrollWidth != null)
                return document.body.scrollTop;
        return (null);
}
/* END GETTING MOUSE COORDS */