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.ns2 = (this.ns && (this.major == 2));

	this.ns3 = (this.ns && (this.major == 3));

	this.ns4 = (this.ns && (this.major == 4));

	this.ns5 = (this.ns && (this.major > 4));

	this.ie = (agent.indexOf("msie") != -1);

	this.ie3 = (this.ie && (this.major == 2));

	this.ie4 = (this.ie && (this.major >= 4));

	this.op3 = (agent.indexOf("opera") != -1);

	this.pc  = (agent.indexOf("win") != -1);

}



var is = new Is()