showModalDialog， 传递window 不及格的程序员

function setFormula() 
        {
            if (window.opener != null)
            {
                var parentWin = window.opener;
                parentWin.document.getElementById("txtFormula").value = document.getElementById("txtFormulaAll").value;
                parentWin.document.getElementById("txtSql").value = document.getElementById("txtSql").value;
            }
            else if (window.dialogArguments)
            {
                var parentWin = window.dialogArguments;
                parentWin.document.getElementById("txtFormula").value = document.getElementById("txtFormulaAll").value;
                parentWin.document.getElementById("txtSql").value = document.getElementById("txtSql").value;
            }
            window.close();
        }