function selectButton(num)
{
	var rating;
	
	rating = document.getElementById("comment_rating");
	
	//change the rating
	rating.value = num;
	
	switch(num)
	{
		case 1:
			document.getElementById("negative_button").src = "/images/btn-negative-clicked.png";
			document.getElementById("neutral_button").src = "/images/btn-neutral.png";
			document.getElementById("positive_button").src = "/images/btn-positive.png";
		break;
		
		case 2:
			document.getElementById("neutral_button").src = "/images/btn-neutral-clicked.png";
			document.getElementById("negative_button").src = "/images/btn-negative.png";
			document.getElementById("positive_button").src = "/images/btn-positive.png";
		break;
		
		case 3:
			document.getElementById("positive_button").src = "/images/btn-positive-clicked.png";
			document.getElementById("negative_button").src = "/images/btn-negative.png";
			document.getElementById("neutral_button").src = "/images/btn-neutral.png";
		break;
		
		default:
		
		break;
	}
	
}