/*
  Validate target attribute XHTML Strict or HTML 4.0 Strict
  http://www.flash-free.org/en/2008/05/17/validar-atributo-target-xhtml-strict-o-html-40-strict/
  
*/

// ====================================     with MooTools

function fix_external_links() { 
    $ES('a').each(function(el) { 
        if (el.getProperty('rel') == 'external') { 
            el.addEvent('click', function(e) { 
                e = new Event(e); 
                e.stop();     
                window.open(this.getProperty('href')); 
            }.bind(el)); 
        }     
    }); 
} 
 
window.addEvent('domready', function() {  
    fix_external_links(); 
});

// ====================================     without MooTools

function fix_external_links() { 
    if (!document.getElementsByTagName) return; 
    var anchors = document.getElementsByTagName("a"); 
    for (var i = 0; i < anchors.length; i++) { 
        var anchor = anchors[i]; 
        if (anchor.getAttribute("rel") && anchor.getAttribute("rel") == "external") { 
            anchor.target = "_blank"; 
        }  
    } 
} 
window.onload = fix_external_links;

http://www.flash-free.org/en/2008/05/17/validar-atributo-target-xhtml-strict-o-html-40-strict

Validate target attribute XHTML Strict or HTML 4.0 Strict

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