Save parent wondow

Hi,

I want to save the parent page(crm entity form) on save of the child page(also a crm entity form), so I used below code on save of child page but none of them worked:

window.top.opener.parent.Xrm.Page.data.entity.save();

window.parent.opener.Xrm.Page.data.entity.save();

Please let me know to do this? I am using ms crm 2011.