// browser sniffing
function browserCheck() {
    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.ns4b = (this.ns && ((this.minor < 4.04) || (this.minor == 4.7)));
    this.ns4 = (this.ns && (this.major == 4));
		this.ns6 = (this.ns && (this.major == 5));
    this.ie   = (agent.indexOf("msie") != -1);
    this.ie4  = (this.ie && (this.major == 4));
    this.ie5 =  (this.ie && agent.indexOf("msie 5.0")!=-1);
    this.ie55 = (this.ie && agent.indexOf("msie 5.5")!=-1);
		this.ie6 = (this.ie && agent.indexOf("msie 6.0")!=-1);
    this.win   = (agent.indexOf("win")!=-1);
    this.mac   = (agent.indexOf("mac")!=-1);
}

var is = new browserCheck();