// Allow new window anchor tags to be XHTML compliant using the following
//NB: to get your a element to use this, add "rel='external'" to the anchor tag instead of "target='_blank'"
// Thanks to the guys at sitepoint for this one - http://www.sitepoint.com/article/standards-compliant-world/3

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" ) == "external" )
            anchor.target = "_blank";
    }
}

window.onload = externalLinks;