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" )
        {
            if ( anchor.getAttribute("className") )
            {
                anchor.target = anchor.getAttribute("className");
            }
            else
            {
                anchor.target = "_blank";
            }
        }
    }
}