Unable to pass value in window.showModalDialog

I have been working with  window.showModalDialog  to show custom aspx page on click on button in CRM 2011 and passing sharedObject  to ModalDilog, But when I try to get sharedObject   at ModalDilog I am getting undefined.

any suggestions,help...

code for Parent page

function ShowModal () {
 var formule = document.getElementById ("conditiondetails");


            var sharedObject = {};
            sharedObject.formule = formule.value;


            if (window.showModalDialog) {
                var retValue = showModalDialog ("http://uvo1jn2qrsoxiamwd5x.vm.cld.sr:8080/GhatanaPluginConfiguration.aspx", sharedObject, "dialogWidth:200px; dialogHeight:200px; dialogLeft:300px;");
                if (retValue) {
                    UpdateFields (retValue.formule);
                }
            }
            else {
                    // for similar functionality in Opera, but it's not modal!
                var modal = window.open ("http://uvo1jn2qrsoxiamwd5x.vm.cld.sr:8080/GhatanaPluginConfiguration.aspx", null, "width=300,height=300,left=300,modal=yes,alwaysRaised=yes", null);
                modal.dialogArguments = sharedObject;
            }
        }

code for Child page

<script type="text/javascript">
         function Init() {
             var sharedObject = window.dialogArguments;

             var formule = document.getElementById("TextBox1");

             formule.value = sharedObject.formule;

         }

         function OnOK() {
             var formule = document.getElementById("TextBox1");


             if (window.showModalDialog) {
                 var sharedObject = {};
                 sharedObject.formule = formule.value;


                 window.returnValue = sharedObject;
             }
             else {
                 // if not modal, we cannot use the returnValue property, we need to update the opener window
                 window.opener.UpdateFields(formule.value);
             }
             window.close();
         }

         function OnCancel() {
             window.close();
         }
    </script>

                                    

---

Thanks Regards Prashanth Kamasamudram Even the least work done for others awakens the power within; even thinking the least good of others gradually instills into the heart the strength of a lion.