function navObj(){
	this.browser = window.navigator.userAgent;
	this.ie = this.browser.indexOf("MSIE") > 0 && this.browser.indexOf("Opera") < 0;
	this.moz = this.browser.indexOf("Gecko") > 0 && this.browser.indexOf("Opera") < 0;
	this.ns4 = (!this.ie && parseInt(navigator.appVersion) == 4);
	this.opera6 = this.browser.indexOf("Opera 6") > 0;
}

function checkBrowserMoz6(){
	this.browser = window.navigator.userAgent;
	if(this.window.navigator.userAgent.indexOf("Gecko") > 0 && this.window.navigator.userAgent.indexOf("Netscape6") > 0 && this.window.navigator.userAgent.indexOf("Opera") < 0){
	   return true;
	}else{ 
	    return false;
	}
} 

nav = new navObj();