I think _self may be a good bet. That's as far as I'm willing to go.
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Window open() Method
Window Object
Definition and Usage
The open() method opens a new browser window.
Syntax
window.open(URL,name,specs,replace)
Parameter Description
URL Optional. Specifies the URL of the page to open. If no URL is specified, a new window with about:blank is opened
name Optional. Specifies the target attribute or the name of the window. The following values are supported:
_blank - URL is loaded into a new window. This is default
_parent - URL is loaded into the parent frame
_self - URL replaces the current page
_top - URL replaces any framesets that may be loaded
name - The name of the window
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