// D'après le script dom-drag.js
// www.youngpup.net
 
var Drag = {
		obj : null,

		init : function(o) {
                    o.onmousedown = Drag.start;
                    o.onDragEnd = new Function();
                },

                start : function(e) {
                    e = Drag.fixE(e);
                    var o = Drag.obj = this;
                    o.lastMouseX = e.clientX;
                    o.lastMouseY = e.clientY;
                    document.onmousemove = Drag.drag;
                    document.onmouseup = Drag.end;
                    return false;
                },

                drag : function(e) {
                    e = Drag.fixE(e);
                    var o = Drag.obj;
                    var newX = parseInt(o.style.left) + e.clientX - o.lastMouseX;
                    var newY = parseInt(o.style.top) + e.clientY - o.lastMouseY;
                    Drag.obj.style.left = newX + "px";
                    Drag.obj.style.top = newY + "px";
                    Drag.obj.lastMouseX = e.clientX;
                    Drag.obj.lastMouseY = e.clientY;
                    return false;
                },

                end : function(e) {
                    e = Drag.fixE(e);
                    document.onmousemove = null;
                    document.onmouseup = null;
                    Drag.obj.onDragEnd(e.clientX, e.clientY);
                    Drag.obj = null;
                },

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