var version = navigator.appVersion.toLowerCase();
var agent = navigator.userAgent.toLowerCase();
var ie = (version.indexOf('msie')>-1);
var ie50 = (version.indexOf('msie 5.0')>-1);
var win = (version.indexOf('windows')>-1);
var opera = (agent.indexOf('opera')>-1);
var dom = document.getElementById ? true : false;
var ie4 = ((document.all) && (!dom)) ? true : false;


function show_buble(cis) {
    var element = 'bubble_'+cis;
    if (dom) document.getElementById(element).style.display = 'block';
    else if (ie4) document.all[element].style.display = 'block';
    }

function hidden_bubble(cis) {
    var element = 'bubble_'+cis;
    if (dom) document.getElementById(element).style.display = 'none';
    else if (ie4) document.all[element].style.display = 'none';  
    }