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Добавки к Вашему коду

function setOnclick(a) {
a.setAttribute("onclick","popupWin = window.open(this.href,'contacts','location,width=4 90,height=368,top=0'); popupWin.focus(); return false")
}
...
link = links[i];
if (link.getAttribute("href") && link.getAttribute("rel") == "external")
link.target = "_blank";
setOnclick(link)
}