function linkTarget()
{
    var links = document.getElementsByTagName("a");
    for(var i=0;i<links.length;i++)
    {
        links[i].setAttribute("target","_blank");
    }
    
    links = document.getElementsByTagName("area");
    for(var i=0;i<links.length;i++)
    {
        links[i].setAttribute("target","_blank");
    }
}
linkTarget();