// Determine browser.
function WebInfraIs() {
        agent  = navigator.userAgent.toLowerCase();
        this.major = parseInt(navigator.appVersion);
        this.minor = parseFloat(navigator.appVersion);

        this.ns    = ((agent.indexOf('mozilla')   !=   -1) &&
                     ((agent.indexOf('spoofer')   ==   -1) &&
                     (agent.indexOf('compatible') ==   -1)));
        this.moz    = ((agent.indexOf('mozilla')   !=   -1) &&
                     (agent.indexOf('spoofer')   ==   -1)   &&
                     (agent.indexOf('compatible') ==   -1)  &&
                     (agent.indexOf('netscape')   ==   -1) );
        this.ns2   = (this.ns && (this.major      ==    3));
        this.ns3   = (this.ns && (this.major      ==    3));
        this.ns4b  = (this.ns && (this.major      ==    4) &&
                     (this.minor                  <= 4.03));
        this.ns4   = (this.ns && (this.major      <    5));
        this.ns6    = (this.ns && (this.major     >=    5));
        this.ie    = (agent.indexOf("msie")       !=   -1);
        this.ie3   = (this.ie && (this.major      <     4));
        this.ie4   = (this.ie && (this.major      ==    4) &&
                     (agent.indexOf("msie 5.0")   ==   -1));
        this.ie5   = (this.ie && (this.major      ==    4) &&
                     (agent.indexOf("msie 5.0")   !=   -1));
        this.ie55  = (this.ie && (this.major      ==    4) &&
                     (agent.indexOf("msie 5.5")   !=   -1));
  }

if (typeof(is)=='undefined'){
    var is = new WebInfraIs();
}
var isBr = new WebInfraIs();