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<script language="JavaScript">
<!--

function pop_up(url, winName, features){
    bitch = window.open(url, winName, features);
}

function changer(){
    bitch.location.href = 'main_win.html';
}
//-->
</script>

und dann halt zwei links:

<a href="javascript:pop_up('popper.html','popper','width=695,height=442')">pop up!</a>

<a href="javascript:changer()">redirect popper win</a>

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window.close('Fenstername')

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window.open(url, winName, features);