Open pop ups in new windows

[Alfa]

I have some pop ups in my website, and I want to open the next pop up in a new window. However, it currently opens in the same window. How can I fix this?\[code\]function pop_up(url) { newwindow = window.open(url, 'name', 'height=517,width=885,scrollbars=yes, toolbar=no,menubar=no,resizable=yes,location=no,directories=no,status=no, titlebar=no,left=400,top=120'); if (window.focus) { newwindow.focus() } return false;}Page.ClientScript.RegisterStartupScript(GetType(), "popup", "pop_up('" + "PopUpEmailing.aspx" + "');", true);\[/code\]