function randomImg(n, prefix) {
	//Generate a random number from 1 to n
	var ranNum = Math.floor(Math.random() * n) + 1;
	
	//Create the random id by concatenating the prefix and the random number
	var id = prefix + ranNum;
	
	if (document.getElementById(id)) {
		document.getElementById(id).style.display = 'inline';
	}
}