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.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.ns6 = (navigator.userAgent.indexOf("Netscape6") != -1) 
	this.ns7 = (navigator.userAgent.indexOf("Netscape/7") != -1) 
	this.Mac5 = ((navigator.appVersion.indexOf("Mac") != -1) || (navigator.appVersion.indexOf("PPC") != -1)) && (navigator.appVersion.indexOf("5.") != -1);
	

}
IE5 = (navigator.appVersion.indexOf("MSIE 5.")!=-1)
IE6 = (navigator.appVersion.indexOf("MSIE 6.")!=-1)
IE5plus = IE5 || IE6;

var is = new Is();