close browser window after form post

here's situation.

i have symbol asp.net webform. symbol creates new browser window indicating page lot dark fields (which boldly generated). form submits itself sql observant services bodies onload event. works glorious news displayed new window.

however, i wish still post form sql observant services nonetheless i wish behind an comparison spreadsheet. i supplement another dark quarrel name rs:format value excel. works user gets choice download comparison file.

however stranded additional window created. i around this? i've attempted formulating enterprising form post same window, nonetheless following (empty) page form, page generated news from. i've attempted shutting window i've combined nonetheless i don't know where put javascript this. i put onload, following window closes but form being submitted.

any ideas here?

edit: i doing here wasn't best proceed removing outcome i needed. i finished adult controlling webrequest comparison news observant services instead posting form, therefore i didn't need second window afterall.