function BrowserCheck() {
	var ua = navigator.userAgent.toLowerCase();
	this.win = ua.indexOf('win') != -1 ? true : false;
	this.mac = ua.indexOf('mac') != -1 ? true : false;
	
	this.dom2 = document.getElementById ? true : false;
	this.ie4 = document.all ? true : false;
	this.ie5 = this.ie4 && this.dom2 ? true : false;
	this.ns4 = document.layers ? true : false;
	this.ns6 = !this.ie4 && this.dom2 ? true : false;
}