var currFeature = 1;
function changeImage() {
	arrFeatureImages = new Array("images/home_page_feature_1.jpg", "images/home_page_feature_2.jpg", "images/home_page_feature_3.jpg");
	document.getElementById('featureImg').src = arrFeatureImages[currFeature];
	if (currFeature < (arrFeatureImages.length-1)) {
		currFeature++;
	} else {
		currFeature = 0;
	}
	setTimeout('changeImage();',4000);
}

/*  RECIPES - RANDOM */
function randomRecipe() {
	recipeImages = new Array("images/recipes_baked_goods.jpg", "images/recipes_chicken_crepes.jpg", "images/recipes_desserts.jpg", "images/recipes_drinks.jpg", "images/recipes_lasagna.jpg", "images/recipes_soups.jpg");
	recipeLinks = new Array("recipes_baked.jsp", "recipes_dishes.jsp", "recipes_desserts.jsp", "recipes_beverages.jsp", "recipes_dishes.jsp#vegetable_lasagna", "recipes_soups.jsp");
	recipeText = new Array("櫻桃胡桃長方麵包", "美味法式雞肉薄餅", "菠蘿香蕉批", "熱帶雪芭", "意大利四式芝士素菜千層麵", "蕃茄忌廉湯");
	var i = Math.round((recipeImages.length-1)*Math.random());
	document.getElementById("recipe-img").innerHTML = '<a href="' + recipeLinks[i] + '"><img src="' + recipeImages[i] + '" title="怡保康 SR與特為糖尿病人設計的食譜" alt="title="怡保康 SR與特為糖尿病人設計的食譜"></a><br><br><strong>食譜:</strong><br><a href="' + recipeLinks[i] + '">' + recipeText[i] + '</a><br>';
}

function calcMetric() {
	var meters = arguement[1];
	var kilograms = arguement[2];
	var BMI = Math.round(((kilograms/(meters * meters))*10)/10);

	this.form.calcval.value = BMI;
}

function calcEnglish() {
	var feet = arguement[1];
	var inches = arguement[2];
	var pounds = arguement[3];
	var calcinches = (feet * 12) + inches;
	
	var BMI = Math.round(((pounds/(calcinches * calcinches))*10)/10);

	this.form.calcval.value = BMI;
}