弹窗并取值

父窗口窗代码
function SelectAgent()
  {
    var retvalue=window.showModalDialog('CardOver_FKSQuery.aspx','aaaa','dialogHeight:500px;dialogWidth:702px');
    if(typeof(retvalue)!="undefined")
    {
      var ddl=document.getElementById("DDL");
      var j=ddl.options.length;
      for(var i=0;i<j;i++)
      {
         if(ddl(i).value==retvalue)
         {
            ddl(i).selected=true;
         }
      }
    }
  }   
子窗口代码

<title></title>
        <base target="_self">
        <script>
    var orows;//当前行
    var rowscount;//总行数
    function ChangColor()
    {
        rowscount=document.getElementById("ListGrid").rows.length;
        var e = e || window.event;
        var otarget = e.srcElement || e.target;
        var rowindex=otarget.parentElement.rowIndex;
        if(otarget.parentNode.tagName.toLowerCase() == "tr"&&rowindex!=0&&rowindex!=rowscount)
        {                
           if(typeof(orows)=="undefined")
           {
             orows = otarget.parentNode;
             orows.style.backgroundColor = "#e7e7ff";            
           }
           else
           {
           orows.style.backgroundColor = "#e7e7ff";
           orows = otarget.parentNode;
           orows.style.backgroundColor = "#FFFF99";
           }  
           if(e.type=="dblclick")
           {
              returnValue=orows.children[0].innerText;
              close();
           }        
         }
    }
        </script>