function base_head()
{
    document.getElementsByTagName('base')[0].href = document.getElementsByTagName('base')[0].href;
}
function base_foot()
{
    var base = document.getElementsByTagName('base')[0].href;
    var page = window.location.href;
    document.getElementsByTagName('base')[0].href = "";
    var as = document.getElementsByTagName('a');
    for (var i = 0; i < as.length; ++ i)
	if  (  as[i].href.indexOf("#") >= 0
	    && as[i].href.split('#')[0] == page.split('#')[0]
	    )
	    as[i].href = as[i].href;
    document.getElementsByTagName('base')[0].href = base;
}
function base_frag()
{
    var base = document.getElementsByTagName('base')[0].href;
    var page = window.location.href;
    var as = document.getElementsByTagName('a');
    for (var i = 0; i < as.length; ++ i)
	if (as[i].href.indexOf(base+'#') == 0)
	    as[i].href = page.split('#')[0] + as[i].href.substr(base.length);
}