var img1 = new Image()
img1.src = "/com/img/buttons/b1-over.jpg";
var img2 = new Image()
img2.src = "/com/img/buttons/b2-over.jpg";
var img3 = new Image()
img3.src = "/com/img/buttons/b2-over.jpg";
var img4 = new Image()
img4.src = "/com/img/buttons/b3-over.jpg";
var img5 = new Image()
img5.src = "/com/img/buttons/b4-over.jpg";
var img6 = new Image()
img6.src = "/com/img/buttons/b6-over.jpg";


for(i=1;i<=6;i++) {
    var bname = "b" + i;
    var btn = document.getElementById(bname);
    if(bname == menuSelect) {
        btn.src="/com/img/buttons/" + bname + "-over.jpg";
    }else{
        btn.onmouseover = function() {this.src="/com/img/buttons/" + this.id + "-over.jpg";}
        btn.onmouseout = function() {this.src="/com/img/buttons/" + this.id + ".jpg";}
    }
}