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javascript parent and child window

<a href="javascript:void(0);" style="width:100%; height:125%" onclick="window.open('otherExpenses.php','Ratting','width=350,height=550,left=50,top=50,toolbar=1,status=1,');">Open Child</a>

       

<a href="javascript:void(0);" onclick="post_value()">Close Child</a>

       

function post_value()

{

    opener.document.overHeads.overheadOther.value = document.otherExpenses.TextBox27.value;

    opener.document.overHeads.hiddenOther.value = document.otherExpenses.TextBox27.value;

    //here I want to call a function from the parent window that updates some field in the parent window.

    self.close();

}

       

//w is the child window

w.document.getElementById('theId').onchange(window.somefunction);