/**
 * Extends jquery selector matching the href of
 * anchor tags against the current window.location.
 */
 
jQuery.extend(
    jQuery.expr[":"],
    {
        current: function(a) {
            return matches_path(a);
        }
    }  
);


function matches_path(a)
{
    var path = window.location.pathname;
    var href = $(a).attr('href');
    if(href == path) return true;
    return false;
}