function addToCart(form_id){
	var form=$(form_id);
	form.submit();
}

//images listers
function createImage(src,width,height){
	var img=new Image();
	img.src=src;
	return img;
}
var curImageIndex=0;

function getImageBySrc(imgSrc){
	imgSrc=imgSrc.toLowerCase().replace("%20"," ");
	for(var i=0;i<serialImages.length;i++){
		var img=serialImages[i];
		imgSrc2=img.src.toLowerCase().replace("%20"," ");
		if(imgSrc2==imgSrc)
			return img;
	}
	return null;
}

function showImage(imgId){
	var img=$(imgId);
	var img2=getImageBySrc(img.src);
	var w=img2.width+20;
	var h=img2.height+20;
	
	window.open(img.src,'image_window','status=no,menubar=no,location=no,resizable=yes,scrollbars=yes,left=100,top=10,width='+w+',height='+h);
}

function showImage2(imgSrc){
	var img2=getImageBySrc(imgSrc);
	var w=img2.width+20;
	var h=img2.height+20;
		
	window.open(imgSrc,'image_window','status=no,menubar=no,location=no,resizable=yes,scrollbars=yes,left=100,top=10,width='+w+',height='+h);
}

function setImage(selectedImageIndex){	
	$('serial_image').src=serialImages[selectedImageIndex].src;
}

function prevImage(){
	if(curImageIndex>0)
		curImageIndex--;
	$('cur_img_no').innerHTML=(1+curImageIndex);
	setImage(curImageIndex);
		
	updateImageSliderButtons();
}

function nextImage(){
	if(curImageIndex<(serialImages.length-1) )
		curImageIndex++;
	$('cur_img_no').innerHTML=(1+curImageIndex);
	setImage(curImageIndex);
		
	updateImageSliderButtons();
}

function updateImageSliderButtons(){
	if(serialImages.length==0)
		$('cur_img_no').innerHTML=0;
	
	if(serialImages.length<2 || curImageIndex==0)
		$("prev_img_btn").style.visibility="hidden";
	else
		$("prev_img_btn").style.visibility="visible";
		
	if(serialImages.length<2 || curImageIndex==serialImages.length-1)
		$("next_img_btn").style.visibility="hidden";
	else
		$("next_img_btn").style.visibility="visible";
}