Complete example of JS pop-up div layer that can be dragged and closed_javascript skills

<script><br> window.onload = function ()<br> {<br> var oWin = document.getElementById("win");<br> var oBtn = document.getElementsByTagName("button")[0];<br> var oClose = document.getElementById("close");<br> var oH2 = oWin.getElementsByTagName("h2")[0];<br> var bDrag = false;<br> var disX = disY = 0;<br> oBtn.onclick = function ()<br> {<br> oWin.style.display = "block" <br> };<br> oClose.onclick = function ()<br> {<br> oWin.style.display = "none"<br> <br> };<br> oClose.onmousedown = function (event)<br> {<br> (event || window.event).cancelBubble = true;<br> };<br> oH2.onmousedown = function (event)<br> { <br> var event = event || window.event;<br> bDrag = true;<br> disX = event.clientX - oWin.offsetLeft;<br> disY = event.clientY - oWin.offsetTop; <br> this.setCapture && this.setCapture(); <br> return false<br> };<br> document.onmousemove = function (event)<br> {<br> if (!bDrag) return;<br> var event = event || window.event;<br> var iL = event.clientX - disX;<br> var iT = event.clientY - disY;<br> var maxL = document.documentElement.clientWidth - oWin.offsetWidth;<br> var maxT = document.documentElement.clientHeight - oWin.offsetHeight; <br> iL = iL < 0 ? 0 : iL;<br /> iL = iL > maxL ? maxL : iL; <br> iT = iT < 0 ? 0 : iT;<br /> iT = iT > maxT ? maxT : iT;<br> <br> oWin.style.marginTop = oWin.style.marginLeft = 0;<br> oWin.style.left = iL "px";<br> oWin.style.top = iT "px"; <br> return false<br> };<br> document.onmouseup = window.onblur = oH2.onlosecapture = function ()<br> {<br> bDrag = false; <br> oH2.releaseCapture && oH2.releaseCapture();<br> };<br> };<br> </script>

Popup layer