var nn6 = document.getElementById && !document.all;

var isdrag=false;
var x,y;
var dobj;

function movemouse(ev) {
	ev = window.event ? window.event : ev;

	if (isdrag) {

		if ( (tx + ev.clientX - x) >= '0') {
			dobj.style.left = '0px';
		} else if ( (tx + ev.clientX - x) < maxW) {
			dobj.style.left = maxW + 'px';
		} else {
			dobj.style.left = tx + ev.clientX - x + 'px';
		}

		if ( (ty + ev.clientY - y) >= '0') {
			dobj.style.top = '0px';
		} else if ( (ty + ev.clientY - y) < maxH) {
			dobj.style.top = maxH + 'px';
		} else {
			dobj.style.top  = ty + ev.clientY - y + 'px';
		}

		return false;
	}
}

function selectmouse(e) {
  var fobj = nn6 ? e.target : event.srcElement;
 // var topelement = nn6 ? "HTML" : "BODY";

	var topelement = "HTML";

  while (fobj.tagName != topelement && fobj.className != "dragme") {
	  fobj = nn6 ? fobj.parentNode : fobj.parentElement;
  }

  if (fobj.className=="dragme") {
    isdrag = true;
    dobj = fobj;
    tx = parseInt(dobj.style.left+0);
    ty = parseInt(dobj.style.top+0);
    x = nn6 ? e.clientX : event.clientX;
    y = nn6 ? e.clientY : event.clientY;
    document.onmousemove=movemouse;
    return false;
  }
}

document.onmousedown = selectmouse;
document.onmouseup = new Function("isdrag=false");