Can somebody please tell me why this code isn't working properly?

Code:
ClientScript.RegisterClientScriptBlock(Me.GetType, "onload", "<script>window.open ('NVH_Concise_Results.aspx.vb?bolt=" & BPddl.SelectedValue & "&diameter=" & Diddl.SelectedValue & "&vehicle=" & Veddl.SelectedValue & "&width=" & Widdl.SelectedValue, "', 'SearchResults','location=0, status=1, scrollbars=1');</script>")