var agent=navigator.userAgent.toLowerCase();
var major = parseInt(navigator.appVersion);
var minor = parseFloat(navigator.appVersion);
var isns  = ((agent.indexOf('mozilla')!=-1) && (agent.indexOf('spoofer')==-1)
            && (agent.indexOf('compatible') == -1) && (agent.indexOf('opera')==-1)
            && (agent.indexOf('webtv')==-1));
var isns4up = (isns && (major >= 4));
var isns5up = (isns && (major >= 5));
var isie   = (agent.indexOf("msie") != -1);
var isie4up  = (isie  && (major >= 4));
var doTimeout=false;
var timeoutId;