利用javascript移动div层-javascript 拖动层

利用javascript移动div层-javascript 拖动层:
程序功能:利用javascript开发在界面上随意拖动以下html code中的div层.
javascript移动div层-javascript 拖动层代码-
html code:

<div id="div_Info" style="display: none; dz-index: 101; left: 175px; width: 650px; 
position: absolute; top: 346px;" align="center"> 
<table border="0" cellpadding="0" cellspacing="0"> 
<tr> 
<%-- 以下td中添加了javascript代码移动层,拖动层的几个事件 
onmousedown事件当鼠标单击时发生 
onmousemove 事件会在鼠标指针移动时发生 
onmouseup 事件会在鼠标按键被松开时发生, 
onmouseout 事件会在鼠标指针移出指定的对象时发生--%> 
<td style="width: 628px; height: 22px; background-color: #3f3200;" class="div_table_bian" 
onmousedown="movetianyamessage(div_Info, event)" onmousemove="movetianyamessageend(event);" 
onmouseup="movetianyamessageend(event)" onmouseout="movetianyamessageend(event)"> 
</td> 
<td style="width: 22px; background-color: #221B00; font-size: 12px; color: #ffffff; 
height: 22px;" align="center" class="div_table_notLeft_bian" > 
<a href="javascript:disponseNone(div_Info)" style=" color:White;">x</a></td> 
</tr> 
<tr> 
<td colspan="2" style="background-color: #000000" align="center" valign="top" class="div_table_notTop_bian"> 
<table border="0" cellpadding="0" cellspacing="0" style="width: 90%"> 
<tr> 
<td style="height: 25px;"></td> 
</tr> 
<tr> 
<td style="height: 23px;" class="white12px" align="center"> 
<asp:Label ID="div_lblTitle" runat="server" Font-Size="16px"></asp:Label></td></tr> 
<tr><td style="height: 15px" valign="top"></td></tr> 
<tr><td id="Div_Td_Content" runat="server" class="white12px" valign="top"></td></tr> 
<tr><td runat="server" class="white12px" valign="top" style="height: 15px"></td></tr> 
<tr><td class="white12px" style="height: 40px" align="center" valign="middle"> 
<asp:ImageButton ID="ImageButton2" runat="server" ImageUrl="~/images/returns.jpg" 
OnClientClick="disponse_div(div_Info);return false;" /></td></tr> 
</table> 
</td></tr> 
</table> 
</div>

javascript移动div层-javascript 拖动层代码-javascript code:

<script language="javascript"> 
// javascript文件 
/*调用方法 
//onmousedown="movetianyamessage(div_Info, event)" onmousemove="movetianyamessageend(event);" 
//onmouseup="movetianyamessageend(event)" onmouseout="movetianyamessageend(event)" 
//onmousedown=鼠标点下的时候 onmousemove=鼠标经过的时候 onmouseup=鼠标弹起来的时候 onmouseout=鼠标离开的时候 
*/ 
var tianyamessage = '' 
var iLayerMaxNum = 999; 
document.onmouseup = movetianyamessageend; 
document.onmousemove = movetianyamessagestart; 
var tianyamessagepixefX; 
var tianyamessagepixefY; 
function movetianyamessage(Object, event) 
{ 
tianyamessage = Object.id; 
if(document.all) 
{ 
document.getElementById(tianyamessage).setCapture(); 
tianyamessagepixefX = event.x - document.getElementById(tianyamessage).style.pixelLeft; 
tianyamessagepixefY = event.y - document.getElementById(tianyamessage).style.pixelTop; 
} 
else if(window.captureEvents) 
{ 
window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP); 
tianyamessagepixefX = event.layerX; 
tianyamessagepixefY = event.layerY; 
} 
document.getElementById(tianyamessage).style.zIndex = iLayerMaxNum; 
iLayerMaxNum = iLayerMaxNum + 1; 
} 
function movetianyamessagestart(evt) 
{ 
if(tianyamessage!=''){ 
if(document.all) 
{ 
document.getElementById(tianyamessage).style.left = event.x - tianyamessagepixefX; 
document.getElementById(tianyamessage).style.top = event.y - tianyamessagepixefY; 
} 
else if(window.captureEvents) 
{ 
document.getElementById(tianyamessage).style.left = (evt.clientX - tianyamessagepixefX) + "px"; 
document.getElementById(tianyamessage).style.top = (evt.clientY - tianyamessagepixefY) + "px"; 
} 
} 
} 
function movetianyamessageend(evt) 
{ 
if(tianyamessage!='') 
{ 
if(document.all) 
{ 
document.getElementById(tianyamessage).releaseCapture(); 
tianyamessage=''; 
} 
else if(window.captureEvents){ 
window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP); 
tianyamessage=''; 
} 
} 
} 
function disponse_div(obj) 
{ 
if(obj.style.display=="block") 
{ 
obj.style.display="none"; 
} 
else 
{ 
obj.style.display="block"; 
} 
} 
</script>