function externalLinks()
{
if (!document.getElementsByTagName) return;
var anchors = document.getElementsByTagName("a");
for (var i=0; i<anchors.length; i++)
{
var anchor = anchors[i];
if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "internal")
anchor.target = "_self";
else
anchor.target = "mainwindow";
}
}