function tracker(){
	
	page_url=escape(location.href);
	referrer=escape(document.referrer);
	
	visitor_id=myGetCookie("visitor_id");
	if(visitor_id==null){
		var date = new Date();
		visitor_id=date.getTime()+Math.random();
		mySetCookie("visitor_id",visitor_id,365);
		new_visitor=1;
	}else{
		visitor_id=myGetCookie("visitor_id");
		new_visitor=0;
	}
	
	
	log_url = 'http://track.collablo.com/log.php?member_id='+member_id+'&page_url='+page_url+'&referrer='+referrer+'&visitor_id='+visitor_id+'&new_visitor='+new_visitor+'&page_id='+ad_id;

	document.write("<img src='"+log_url+"'>");
}

function mySetCookie(myCookie,myValue,myDay){
	myExp = new Date();
	myExp.setTime(myExp.getTime()+(myDay*24*60*60*1000));
	myItem = "@" + myCookie + "=" + escape(myValue) + ";";
	myExpires = "expires="+myExp.toGMTString();
	document.cookie =  myItem + myExpires;
}

function myGetCookie(myCookie){
	myCookie = "@" + myCookie + "=";
	myValue = null;
	myStr = document.cookie + ";" ;
	myOfst = myStr.indexOf(myCookie);
	if (myOfst != -1){
		myStart = myOfst + myCookie.length;
		myEnd   = myStr.indexOf(";" , myStart);
		myValue = unescape(myStr.substring(myStart,myEnd));
	}
	return myValue;
}

tracker();