iframe跳转到新页面

第一种:Response.Write("<script>if(parent.frames.length>0)parent.location='ContractEdit.aspx?action=Modify&    contractID=" + Request["contractID"] + "'</script>");
第二种:                  
        Response.Write("<script>top.location.href='ContractEdit.aspx?action=Modify&contractID=" + Request["contractID"] + "'</script>");