弹出层，不使用ShowModalDialog，弹出层移动自由。

<style>
#id1{width:100%;height:100%;background-color:#000;position:absolute;top:0;left:0;z-index:49;display:none;  filter:progid:DXImageTransform.Microsoft.Alpha(opacity=25);
}
#id2{top:200px;position:absolute;z-index:50;display:none;border:3px solid #E5E5E5; left:100px;background-color:white;}
</style>
<script>
function divshow(showmsg){ //弹出窗口
document.getElementById("id1").style.height=window.screen.height+"px";
document.getElementById("id1").style.width=window.screen.width+"px";
document.getElementById("id1").style.display='block';
document.getElementById("id2").style.display='block';
document.getElementById("ShowMSG").innerText = showmsg;
}
function divhide(){  //隐藏窗口
document.getElementById("id1").style.display='none'
document.getElementById("id2").style.display='none'
}

self.onError=null;                             
currentX = currentY = 0;                              
whichIt = null;                                        
lastScrollX = 0; lastScrollY = 0;                             
NS = (document.layers) ? 1 : 0;                            
IE = (document.all) ? 1: 0;                             
<!-- STALKER CODE -->                             
function heartBeat() {                             
if(IE) { diffY = document.body.scrollTop; diffX = document.body.scrollLeft; }                            
if(NS) { diffY = self.pageYOffset; diffX = self.pageXOffset; }          
if(diffY != lastScrollY) {           
percent = .1 * (diffY - lastScrollY);   
if(percent > 0) percent = Math.ceil(percent);
else percent = Math.floor(percent); 
if(IE) document.all.id2.style.pixelTop += percent; 
if(NS) document.id2.top += percent;                
lastScrollY = lastScrollY + percent;     
}                      
if(diffX != lastScrollX) {      
percent = .1 * (diffX - lastScrollX);    
if(percent > 0) percent = Math.ceil(percent);      
else percent = Math.floor(percent);                  
if(IE) document.all.id2.style.pixelLeft += percent;       
if(NS) document.id2.left += percent;      
lastScrollX = lastScrollX + percent;                    
}                          
}                        
<!-- /STALKER CODE -->             
<!-- DRAG DROP CODE -->             
function checkFocus(x,y) {        
stalkerx = document.id2.pageX;    
stalkery = document.id2.pageY;                       
stalkerwidth = document.id2.clip.width;             
stalkerheight = document.id2.clip.height;                        
if( (x > stalkerx && x < (stalkerx+stalkerwidth)) && (y > stalkery && y < (stalkery+stalkerheight))) return true;                     
else return false;       
}                    
function grabIt(e) {           
if(IE) {                           
whichIt = event.srcElement;
while (whichIt.id.indexOf("id2") == -1) {   
whichIt = whichIt.parentElement;                          
if (whichIt == null) { return true; }        
 }                           
whichIt.style.pixelLeft = whichIt.offsetLeft;                             
whichIt.style.pixelTop = whichIt.offsetTop;                         
currentX = (event.clientX + document.body.scrollLeft);                      
currentY = (event.clientY + document.body.scrollTop);                       
} else {                            
window.captureEvents(Event.MOUSEMOVE);   
if(checkFocus (e.pageX,e.pageY)) {                           
whichIt = document.id2;                             
stalkerTouchedX = e.pageX-document.id2.pageX;     
StalkerTouchedY = e.pageY-document.id2.pageY;         
}                             
}                           
return true;                       
}                           
function moveIt(e) {              
if (whichIt == null) { return false; }      
if(IE) {                            
newX = (event.clientX + document.body.scrollLeft);                          
newY = (event.clientY + document.body.scrollTop);               
distanceX = (newX - currentX);    distanceY = (newY - currentY);  
currentX = newX;    currentY = newY;                      
whichIt.style.pixelLeft += distanceX;                         
whichIt.style.pixelTop += distanceY;                     
if(whichIt.style.pixelTop < document.body.scrollTop) whichIt.style.pixelTop = document.body.scrollTop;  
 if(whichIt.style.pixelLeft < document.body.scrollLeft) whichIt.style.pixelLeft = document.body.scrollLeft; if(whichIt.style.pixelLeft > document.body.offsetWidth - document.body.scrollLeft - whichIt.style.pixelWidth - 20) whichIt.style.pixelLeft = document.body.offsetWidth - whichIt.style.pixelWidth - 20;
if(whichIt.style.pixelTop > document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5) whichIt.style.pixelTop = document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5; 
event.returnValue = false; 
} else {  
whichIt.moveTo(e.pageX-StalkerTouchedX,e.pageY-StalkerTouchedY);
if(whichIt.left < 0+self.pageXOffset) whichIt.left = 0+self.pageXOffset;
if(whichIt.top < 0+self.pageYOffset) whichIt.top = 0+self.pageYOffset; 
if( (whichIt.left + whichIt.clip.width) >= (window.innerWidth+self.pageXOffset-17)) whichIt.left = ((window.innerWidth+self.pageXOffset)-whichIt.clip.width)-17;
if( (whichIt.top + whichIt.clip.height) >= (window.innerHeight+self.pageYOffset-17)) whichIt.top = ((window.innerHeight+self.pageYOffset)-whichIt.clip.height)-17;
return false;}
return false; 
}  
function dropIt() {    
whichIt = null;    
if(NS) window.releaseEvents (Event.MOUSEMOVE); 
return true;            
 }                    
<!-- DRAG DROP CODE --> 
if(NS) {   
window.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN);
window.onmousedown = grabIt;
window.onmousemove = moveIt;
window.onmouseup = dropIt;
}             
if(IE) {                    
document.onmousedown = grabIt;   
document.onmousemove = moveIt;  
document.onmouseup = dropIt;         
 }                        
if(NS || IE) action = window.setInterval("heartBeat()",1)
</script>
<div id="id2"> <!--这个是弹出的层-->
  <table height="100" width="200">
    <tr>
      <td>                               
      <div id="ShowMSG">按时打算</div>
      </td>
    </tr>
    <tr>
<td align="center"><input class="Button60" onclick="divhide()" type="button" value="关闭" name="btnDo">
</td>
    </tr>
  </table>
</div>
<div id="id1">这里是弹出层后的背景 可以不放内容</div>
<INPUT TYPE="submit" onclick ="divshow()">
啊是的按时