Javascript - Do actions in parent window when a popup is opened

/*function targetopener(mylink, closeme, closeonly)
{
if (! (window.focus && window.opener))return true;
window.opener.focus();
if (! closeonly)window.opener.location.href=mylink.href;
if (closeme)window.close();
return false;
}
function MM_callJS(jsStr) { //v2.0
return eval(jsStr)
}*/