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Setting target=“_blank” to external links and standards

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If you want your pages to be valid XHTML-Strict, but you also wish to open external links in new window, the following snippet is doing just that—sets attribute target=“_blank” to all external links in a document to keep your code valid XHTML-Strict. You’ll just have to change variable yourURL. Don’t enter http://www. part of your domain, otherwise something like http://sample.com/ will be treated like any other external link.

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Copy this code and paste it in your HTML 
  1. // change your domain name:
  2. var yourURL = "sample.com";
  3. function outLinks() {
  4.   var outLink;
  5.   if (document.getElementsByTagName('a')) {
  6.     for (var i = 0; (outLink = document.getElementsByTagName('a')[i]); i++) {
  7.       if (outLink.href.indexOf(yourURL) == -1) {
  8.         outLink.setAttribute('target', '_blank');
  9.       }
  10.     }
  11.   }
  12. }
  13. window.onload = function() {
  14.     outLinks();
  15. }

URL: http://www.maratz.com/blog/archives/2004/11/29/setting-target_blank-to-external-links/

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