var t;

function scroll_up_down() {
	t = setInterval('scroll_up()',10);
}

function scroll_up_up() {
	clearInterval(t);
}

function scroll_down_down() {
	t = setInterval('scroll_down()',10);
}

function scroll_down_up() {
	clearInterval(t);
}

function scroll_up() {
	var scrollImage = document.getElementById('scroll_image_contain');
	var scroll = document.getElementById('scroll_image');
	
	if (scrollImage.offsetHeight + scrollImage.offsetTop > scroll.offsetHeight) {
		scrollImage.style.top = scrollImage.offsetTop - 2 + 'px' ; 	
	} else {
		clearInterval(t);
	}
	
}

function scroll_down() {
	var scrollImage = document.getElementById('scroll_image_contain');
	
	if (scrollImage.offsetTop <= 0 ) {
		scrollImage.style.top = scrollImage.offsetTop + 2 + 'px' ; 
	} else {
		clearInterval(t);
	}
	
}

function change_Image(img, title){
	var objImage = document.getElementById('main_image');
	var objImageInfo = document.getElementById('image_info');
	objImage.src = img;
	objImageInfo.innerHTML = title;
}

function PreviewImage(strImage, strTitle){
	//var strImage = document.getElementById('product_image').src;
	//var strTitle = document.getElementById('product_image').alt;
	
	Slimbox.open(strImage, strTitle);
}