function init(){
	enemyLV = document.getElementById('lv').innerHTML;
	defaultEXP = document.getElementById('exp').innerHTML;
}

function exp(playerLV){
	x = Math.pow(2/3, playerLV - enemyLV) * defaultEXP;
	if(x<1) return 1;
	else if(x > 9999) return 9999;
	else if(playerLV < enemyLV) return Math.pow(3/4, playerLV - enemyLV) * defaultEXP;
	else return x;
}

function validate(input){
	if(isNaN(input.value)) input.value = enemyLV;
	document.getElementById('exp').innerHTML = parseInt(exp(input.value));
}