function showDiv(num){
	var thediv = document.getElementById("optdiv");
	var thebox = document.getElementById("checker");
	var qty = document.getElementById("qty-box");
	
	if(thebox.checked == true){
		thediv.style.display = "block";
		qty.value = num;
		//qty.disabled = true;
	}else{
		thediv.style.display = "none";
		qty.value = 1;
		//qty.disabled = false;
	}
}