function shownavisub() {

    var navibar = document.getelementbyid("navi") 
    var leftlis = navibar.children[0].children 
    for (var i = 0; i < leftlis.length; i++) {
        leftlis[i].indexof = i;
        leftlis[i].onmouseover = function () {
            if (this.children.length>1) {
                this.children[1].style.display = "block"
            }
            
        }
        leftlis[i].onmouseout = function () {
            if (this.children.length > 1) {
                this.children[1].style.display = "none"
            }
        }
    }
     
}
//shownavisub()