获取传给showModalDialog的参数

父页面：

 var obj = new Object();   
  obj.instockdetailid=ids;  
  obj.num=invnum;
 var result = showModalDialog(strUrl + "inBoundAction&method=ricoExecReadSAP&instockdetail);

result为 showModalDialog的返回值

showModalDialog页面（子页面） 

  var obj = window.dialogArguments;
  var  instockdetailid = obj.instockdetailid;
  var  num  = obj.num;