function externalLinks() {
if (!document.getElementsByTagName) return;
var anchors = document.getElementsByTagName("a");
for (var i = anchors.length-1; i >= 0; i--) {
var anchor = anchors[i];
if (anchor.href) {
if (!anchor.href.match(/^http:\/\/.*mywebsite\.com.*$/))
anchor.target = "_blank";
}
}
}
window.onload = externalLinks;