<script type="text/javascript">
  function open_bill(){
          window.open("bill.jsp","","height=380,width=320,toolbar=0,scrollbars=0,location=0,status=0,menubar=0,resize=0");
          
  }
  function exit_system(){
        window.close();  
  }
  function open_suppliers(){
           window.open("suppliers.jsp","","height=380,width=320,toolbar=0,scrollbars=0,location=0,status=0,menubar=0,resize=0");
  }
  function open_users(){
           window.open("user.jsp","","height=380,width=320,toolbar=0,scrollbars=0,location=0,status=0,menubar=0,resize=0");
  }
</script>
//插入4个按钮，对应上面4个函数
<input type="button" value="账单管理" onClick="open_bill();"/>
<input type="button" value="供应商管理" onClick="open_suppliers();"/>
<input type="button" value="用户管理" onClick="open_users();"/>
<input type="button" value="退出系统" onClick="exit_system"/>

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