var box = document.getElementById('linksBox'); 
    var linksArr = box.getElementsByTagName('a');
     for(i=0; i < linksArr.length; i++) {
        var currExp = new RegExp(linksArr[i].id);
        if(currExp.test(document.location)) { 
            linksArr[i].style.borderBottom = "3px solid #94A1CE"; 
            var set = true;
        } 
        
    } // end for
    if(!set) {
        linksArr[0].style.borderBottom = "3px solid #94A1CE";
    }