var oAddToBasketForm

window.onload = function() {
	var oAddToBasketForm = document.getElementById("add_to_basket_form");
	oAddToBasketForm.onsubmit = function() { validateAddToBasket(this); }
	oAddToBasketForm.elements["quantity"].onblur = function() { fixQuantity(this); }
}

function validateAddToBasket(frm) {
	if (frm.elements['quantity'].value > 0) {
		return true;
	} else {
		alert("Quantity must be a number greater than 0");
		return false;
	}
}