var obj;
var offsetX;
var offsetY;

function doInit() {
   if (document.layers /* Netscape Communicator 4.* */) {
      objlist = document.layers;
   } else if (document.all /* Internet Explorer 5.* */) {
      objlist = document.all.tags("SPAN");
   } else if (document.getElementsByTagName /* Netscape 6 */) {
      objlist = document.getElementsByTagName("SPAN");
   } else {
      return;
   }
   for (i = 0; i < objlist.length; i++) {
      if (document.layers) {
         objlist[i].captureEvents(Event.MOUSEDOWN);
      }
      objlist[i].onmousedown = onMouseDown;
   }
   if (document.layers) {
      document.captureEvents(Event.MOUSEMOVE | Event.MOUSEUP);
   }
   document.onmousemove = onMouseMove;
   document.onmouseup = onMouseUp;
}
function onMouseDown(e) {
   obj = this;
   if (document.layers) {
      offsetX = e.layerX;
      offsetY = e.layerY;
   } else if (document.all) {
      offsetX = event.offsetX + 2;
      offsetY = event.offsetY + 2;
   } else if (obj.getElementsByTagName) {
      offsetX = e.pageX - parseInt(obj.style.left);
      offsetY = e.pageY - parseInt(obj.style.top);
   }
   return false;
}
function onMouseMove(e) {
   if (!obj) {
      return true;
   }
   if (document.layers) {
      obj.pageX = e.pageX - offsetX;
      obj.pageY = e.pageY - offsetY;
   } else if (document.all) {
      obj.style.left = event.clientX - offsetX + document.body.scrollLeft;
      obj.style.top = event.clientY - offsetY + document.body.scrollTop;
   } else if (obj.getElementsByTagName) {
      obj.style.left = e.pageX - offsetX;
      obj.style.top = e.pageY - offsetY;
   }
   return false;
}
function onMouseUp(e) {
   obj = null;
}