function overdaohang(opt)
	{
	   

	  if(opt=='1')
	   {
    
	  document.getElementById("daohang").src='../images/daohang1.jpg';
        return;
	  }
	  if(opt=='2')
	   {
	   
	  document.getElementById("daohang").src='../images/daohang2.jpg';
         return;   
	  }
	  if(opt=='3')
	   {
	
	  document.getElementById("daohang").src='../images/daohang3.jpg';
	  return;
	  }
	 if(opt=='4')
	   {

	  document.getElementById("daohang").src='../images/daohang4.jpg';
	  return;
	  }
	  if(opt=='5')
	   {

	  document.getElementById("daohang").src='../images/daohang5.jpg';
	  return;
	  }
	 if(opt=='6')
	   {

	  document.getElementById("daohang").src='../images/daohang6.jpg';
	  return;
	  }
	   if(opt=='7')
	   {

	  document.getElementById("daohang").src='../images/daohang7.jpg';
	  return;
	  }
	      if(opt=='8')
	   {

	  document.getElementById("daohang").src='../images/daohang8.jpg';
	  return;
	  }
	   if(opt=='9')
	   {

	  document.getElementById("daohang").src='../images/daohang9.jpg';
	  return;
	  }
	}
    function outdaohang()
	{

	  document.getElementById("daohang").src='../images/daohang3.jpg';
	
	
	}  


          function hrefUrl(str)
        {
             window.parent.location.href=str;
        }


        function cover(CheckAll)
        {
            var items=document.body.getElementsByTagName("input");
            for(i=0;i<items.length;i++)
            {
                if(items[i].type=="checkbox")
                {
                    items[i].checked=CheckAll.checked;
                 }
            }
        }
       
  function IsDigit()
{
  return ((event.keyCode >= 48) && (event.keyCode <= 57));
}    
 
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=""  
	         }
	    }
	}