/////////////////////////////////////////////////////
//                                                 //
//  BROWSER SNIFFER                    	           //
//  ---------------------------------------------  //
//                                                 //
/////////////////////////////////////////////////////

function Is() {
    var 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.ns4 = (this.ns && (this.major >= 4));

    this.ie   = (agent.indexOf("msie") != -1);
    this.ie4  = (this.ie && (this.major >= 4));
    this.ie51 = (this.ie && (this.major >= 5) && (this.minor >= 1));
}

var is = new Is();