codice:
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Draggable objects</title>
<script type="text/javascript">
var oDragging, nMouseX, nMouseY, nStartX, nStartY, bDragStop = true, nZFocus = 99 /* lo z-Index maggiore presente nella pagina piu' uno! */, sDnDPref = "dr-drp_";

function dragDown(oPssEvt1) {
	var oMsEvent1 = oPssEvt1 || /* IE */ window.event;
	for (var bExit = true, iNode = oMsEvent1.target; iNode; iNode = iNode.parentNode) {
		if (iNode.className === "draggable") { bExit = false; oDragging = iNode; break; }
	}
	if (bExit) { return; }
	bDragStop = false;
	nStartX = nStartY = 0;
	for (var iOffPar = oDragging; iOffPar; iOffPar = iOffPar.offsetParent) {
		nStartX += iOffPar.offsetLeft;
		nStartY += iOffPar.offsetTop;
	}
	nMouseX = oMsEvent1.clientX;
	nMouseY = oMsEvent1.clientY;
	oDragging.style.zIndex = nZFocus++;
	return false;
}

function dragMove(oPssEvt2) {
	if (bDragStop) { return; }
	var oMsEvent2 = oPssEvt2 || /* IE */ window.event;
	oDragging.style.left = String(nStartX + oMsEvent2.clientX - nMouseX) + "px";
	oDragging.style.top = String(nStartY + oMsEvent2.clientY - nMouseY) + "px";
}

function dragUp() {
	if (!bDragStop && oDragging.id) { document.cookie = escape(sDnDPref + oDragging.id) + "=" + escape(oDragging.style.left + "/" +  oDragging.style.top + "/block/" + oDragging.style.zIndex) + "; path=/"; }
	bDragStop = true;
}

function dragShow(sToShowId) {
	var oToShow = document.getElementById(sToShowId)
	oToShow.style.display = "block";
	oToShow.style.zIndex = nZFocus++;
	document.cookie = escape(sDnDPref + sToShowId) + "=" + escape(oToShow.style.left + "/" +  oToShow.style.top + "/block/" + oToShow.style.zIndex) + "; path=/";
}

function dragHide(sToHideId) {
	var oToHide = document.getElementById(sToHideId);
	oToHide.style.display = "none";
	document.cookie = escape(sDnDPref + sToHideId) + "=" + escape(oToHide.style.left + "/" +  oToHide.style.top + "/none/" + oToHide.style.zIndex) + "; path=/";
}

function dragReset() {
	for (var iCookie, oToSet, aVals, nNewZ, iCouple, iIdx = 0, aCookies = document.cookie.split(/;\s?/); iIdx < aCookies.length; iIdx++) {
		iCouple = aCookies[iIdx].split("=");
		if (iCouple.length < 2) { continue; }
		iCookie = unescape(iCouple[0]);
		if (iCookie.indexOf(sDnDPref) !== 0) { continue; }
		oToSet = document.getElementById(iCookie.slice(sDnDPref.length));
		if (!oToSet) { continue; }
		aVals = unescape(iCouple[1]).split("/");
		if (aVals.length > 0) {
			oToSet.style.left = aVals[0]; oToSet.style.top = aVals[1]; oToSet.style.display = aVals[2]; oToSet.style.zIndex = aVals[3];
			nNewZ = parseFloat(aVals[3]);
			if (nNewZ >= nZFocus) { nZFocus = nNewZ + 1; }
		}
	}
}

document.onmousedown = dragDown;
document.onmousemove = dragMove;
document.onmouseup = dragUp;
document.onkeypress = keyListener;
window.onload = dragReset;

function keyListener(oPssEvt3) {
	var oKeyEvt1 = oPssEvt3 || /* IE */ window.event;
	if (oKeyEvt1.ctrlKey && oKeyEvt1.charCode === 109) { /* ctrl + m */ dragShow("votazione"); }
	else if (oKeyEvt1.ctrlKey && oKeyEvt1.charCode === 122) { /* ctrl + z */ dragHide("votazione"); }
}
</script>
<style type="text/css">
.draggable {
	position: fixed;
	left: 0;
	top: 0;
	width: auto;
	height: auto;
	cursor: move;
	z-index: 98; /* questo puoi anche eliminarlo, era solo per farti capire... ;-) */
}

#votazione {
	width: 300px;
	height: 200px;
	left: 200px;
	top: 200px;
	background-color: #aaaaaa;
	display: none;
}
</style>
</head>

<body>


Votazione: premi ctrl + m per aprire e ctrl + z per chiudere!!</p>
<div class="draggable" id="votazione">


Div votazione!</p>
</div>


<div class="draggable" id="altroDiv" style="background-color:#ccaa77;width:450px;height:200px;left:200px;top:200px;display:none;">


Un altro Div!!</p>


<span style="cursor:pointer;text-decoration:underline;color:#0000ff;" onclick="dragHide('altroDiv');">Chiudi</span></p>
</div>


<span style="cursor:pointer;text-decoration:underline;color:#0000ff;" onclick="dragShow('altroDiv');">Apri altro div!!</span></p>


</body>
</html>
&hellip;cerca di imparare dalle modifiche che ho fatto però!