function blanklinks()
{
    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') == 'blanklink')
            anchor.target = '_blank';
    }
}