function $(_sId)
{return document.getElementById(_sId);}
 
function moveDiv(event, _sId)
{
 var oObj = $(_sId);
 oObj.onmousemove = mousemove;
 oObj.onmouseup = mouseup;
 oObj.setCapture ? oObj.setCapture() : function(){};
 oEvent = window.event ? window.event : event;
 var dragData = {x : oEvent.clientX, y : oEvent.clientY};
 var backData = {x : parseInt(oObj.style.top), y : parseInt(oObj.style.left)};
 
 function mousemove()
 {
  var oEvent = window.event ? window.event : event;
  var iLeft = oEvent.clientX - dragData["x"] + parseInt(oObj.style.left);
  var iTop = oEvent.clientY - dragData["y"] + parseInt(oObj.style.top);
  oObj.style.left = iLeft;
  oObj.style.top = iTop;
  dragData = {x: oEvent.clientX, y: oEvent.clientY};
 }
 
 function mouseup()
 {
  var oEvent = window.event ? window.event : event;
  oObj.onmousemove = null;
  oObj.onmouseup = null;
  if(oEvent.clientX < 1 || oEvent.clientY < 1)
  {
   oObj.style.left = backData.y;
   oObj.style.top = backData.x;
  }
   oObj.releaseCapture ? oObj.releaseCapture() : function(){};
 }
}

function closeDiv(_sID)
{
 var oObj = $(_sID);
 var overlay = $("overlay");
 if(overlay != null)
 {
  overlay.outerHTML = "";
 }
 oObj.style.display = "none";
 
}

function showDiv(_sID,event)
{
 var arrySize = getPageSize();
 var oObj = $(_sID);
 //创建一个DIV,改名为 overlay 这个是透明的层
 var oDiv =document.createElement("div");
 oDiv.id = "overlay";
 oDiv.runat="server";
 document.body.appendChild(oDiv);
 var overlay = $("overlay");
 overlay.style.height = document.body.offsetHeight ;

 overlay.style.width = document.body.offsetWidth;
 //alert(arrySize[1]);
 if(event == null)
 {
  if(oObj.style.left == "")
  {
   oObj.style.left = arrySize[0] / 2 - 150 ;
  }
 
  if(oObj.style.top == "")
  {
   oObj.style.top =  arrySize[0] / 2;
  }
 }
 else
 {
  var iEvent= window.event ? window.event : event;
  oObj.style.left = arrySize[0] / 2 - 150 ; // iEvent.clientX;
  oObj.style.top = arrySize[1] / 2 - 150 ;// iEvent.clientY;
 
 }
 
 oObj.style.display = "block";
 overlay.style.display = "block";
 overlay.style.zindex = oObj.style.zindex - 1;
}

//取得页面大小
function getPageSize(){
 
 var xScroll, yScroll;
 
 if (window.innerHeight && window.scrollMaxY) {
  xScroll = document.body.scrollWidth;
  yScroll = window.innerHeight + window.scrollMaxY;
 } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
  xScroll = document.body.scrollWidth;
  yScroll = document.body.scrollHeight;
 } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
  xScroll = document.body.offsetWidth;
  yScroll = document.body.offsetHeight;
 }
 
 var windowWidth, windowHeight;
 if (self.innerHeight) { // all except Explorer
  windowWidth = self.innerWidth;
  windowHeight = self.innerHeight;
 } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
  windowWidth = document.documentElement.clientWidth;
  windowHeight = document.documentElement.clientHeight;
 } else if (document.body) { // other Explorers
  windowWidth = document.body.clientWidth;
  windowHeight = document.body.clientHeight;
 }
 
 // for small pages with total height less then height of the viewport
 if(yScroll < windowHeight){
  pageHeight = windowHeight;
 } else {
  pageHeight = yScroll;
 }

 // for small pages with total width less then width of the viewport
 if(xScroll < windowWidth){
  pageWidth = windowWidth;
 } else {
  pageWidth = xScroll;
 }


 arrayPageSize = new Array(window.screen.availWidth,window.screen.availHeight,windowWidth,windowHeight)

 return arrayPageSize;
}

function box(opt)
	{

		if(opt=='0')
		{
		
	        var  a=document.getElementById("txtContent").value;
	        if(a==null||a=="")
	        {
	             document.getElementById("txtContent").value="这里输入要查询的图书";
	        }
	        
	       
	    }
	    if(opt=='1')
	    {
	        var  a=document.getElementById("txtContent").value;
	        if(a=="这里输入要查询的图书")
	        {
	         document.getElementById("txtContent").value=""  
	         }
	    }
	}