function showstars(obj) {
number = obj.substr(4,5);

while (number>0) {
	starId="star"+number;
	document.getElementById(starId).style.visibility ="visible";
	number=number-1;
	}
}
		
function hidestars(){
number = 5;
while (number>0) {
	starId = "star"+number;
	document.getElementById(starId).style.visibility = "hidden";
	number = number-1;
	}
}