How to open an aspx page and then add some data to textbox using Javascript

I have some apsx pages and a menu (HTML Menu). When I click a menu Item GetItemById Item.aspx page must open and I have data in Javascript array which is written in some external file and add a reference to master page that inherits all child pages. I am doing with Javascript. I can able to open a page using

window.open("Item.aspx","_self"); and after I am using the following code to insert data into textbox in Item.aspx but I could not able to see the textbox value.

    $("#txtDescription").val(ThisItem.Description);
    $("#txtBCN").val(ThisItem.Barcodenumber);
    $("#txtPurchaseDate").val(ThisItem.PurchaseDate);
    $("#txtPurchaseValue").val(ThisItem.PurchaseValue);
    $("#txtItemDepreciation").val(ThisItem.Depreciation);

but I am unable to see the data in that page. Is Windo.Open cause to refresh the data which is
lost.
Please tell me what I have to do?

Thanks
Ganesh