function validateQuantity(productcode){
	var qtyfield =  document.getElementById('quantity_' + productcode);
	if(parseFloat(qtyfield.value) == parseInt(qtyfield.value)){
		return true;
	} else {
		var word = 'metres';
		if(qtyfield.value < 1){
			word = 'metre';
		}
		return confirm('We can only supply fabrics in full metre lengths. Your order for ' + qtyfield.value + ' will be rounded up to ' + Math.ceil(qtyfield.value) + ' ' + word);
	}
}