var was=false;
function anketa() {
	var ran_number=Math.round(Math.random()*100);
	if(was==false && ran_number<20)
		window.open("anketa/anketa.php","anketa","left=0px,top=0px,width=300px,height=450px,location=no,menubar=no,directories=no,toolbar=no");
	was=true;
}