function getCookieVal(offset)
    {
        var endstr = document.cookie.indexOf(";", offset);
        if(endstr == -1)
        {
            endstr = document.cookie.length;
        }
        return unescape(document.cookie.substring(offset, endstr));
    }

    // primary function to retrieve cookie by name
    function getCookie(name)
    {
        var arg = name + "=";
        var alen = arg.length;
        var clen = document.cookie.length;
        var i = 0;
        while(i < clen)
        {
            var j = i + alen;
            if (document.cookie.substring(i, j) == arg)
            {
                return getCookieVal(j);
            }
            i = document.cookie.indexOf(" ", i) + 1;
            if(i === 0) {break;}
        }
        return;
    }

    // store cookie value with optional details as needed
    function setCookie(name, value, expires, path, domain, secure)
    {
        document.cookie = name + "=" + escape(value) +
            ((expires) ? "; expires=" + expires : "") +
            ((path) ? "; path=" + path : "") +
            ((domain) ? "; domain=" + domain : "") +
            ((secure) ? "; secure" : "");
    }

    // remove the cookie by setting ancient expiration date
    function deleteCookie(name,path,domain) 
    {
        if(getCookie(name))
        {
            document.cookie = name + "=" +
                ((path) ? "; path=" + path : "") +
                ((domain) ? "; domain=" + domain : "") +
                "; expires=Thu, 01-Jan-70 00:00:01 GMT";
        }
    }
    
    function numberFormat(num,how)
    {
    	num = Math.round(num*Math.pow(10,how))/Math.pow(10,how);
    	return num;
    }
    
    
    function countTotal()
    {
    	var products = getCookie("shopcart");
    	var carts = products.split("|");
   		var total = 0;
    	for(var i=0;i < carts.length; i++)
    	{
			var infos = carts[i].split(",");
			alert($("price"+infos[0]));
			var price = $F("price"+infos[0]);
			
			if(price === null)
			{
				price =0;
			}
			total += eval(price)*eval(infos[3]);
    	}
    	alert(total);
    	return total;
    }
    
    function toCookieString(carts,idx)
    {
    	var re = '';
    	for(var i = 0;i < carts.length; i++){
    		if(i!==idx)
    		{
    			re += carts[i];
    			re +='|';
    		}    		
    	}
    	return re;
    }
    
    //buy products action when user clicked 'buy' button
    function buyProduct(pid,amt,cid)
    {
    	if(pid==null){return;}
    	if(amt==null){amt=1;}
    	if(cid==null){cid=0;}
    	var cookiestr = getCookie("shopcart");
    	if(cookiestr==null||cookiestr=="")
    	{
    		cookiestr = "";
    		cookiestr = cookiestr.concat(pid+","+cid+","+amt);
    	}
    	else
    	{
    		cookiestr = saveProduct(pid,cookiestr,amt,cid); 		
    	}
    	setCookie("shopcart",cookiestr);
    	window.open("cart.htm","_blank");
    	return cookiestr;
    }
    
    function deleteProduct(pid,cid)
    {
    	if(cid == null){cid = 0;}
    	var products = getCookie("shopcart");
    	var carts = products.split("|");
    	var idx = -1;
    	products="";
    	for(var i=0;i < carts.length; i++){
			var infos = carts[i].split(",");
			if(infos[0] == pid && infos[1] == cid)
			{
				idx = i;
			}
			else
			{
				products +=infos[0]+","+infos[1]+","+infos[2];
			}
			if(i!==(carts.length-1)&&(i!==idx))
			{
				products +="|";
			}
			if(i==(carts.length-1)&&(i==idx))
			{
				products = products.substr(0,products.length-1);
			}
			//alert(products);
			//$("lbTotalPrice").
    	}
    	setCookie("shopcart",products);
    	$(""+pid).style.display = "none";
    	//return products;
    }
    
    function modifyProduct(pid,amt,cid)
    {
    	if(cid == null){cid = 0;}
    	if(amt==null){amt=1;}
    	var products = getCookie("shopcart");
    	var carts = products.split("|");
    	products="";
    	for(var i=0;i < carts.length; i++){
			var infos = carts[i].split(",");
			if(infos[0] == pid && infos[1] == cid)
			{
				infos[2] = eval(amt);
			}			
			products +=infos[0]+","+infos[1]+","+infos[2];			
			if(i!==(carts.length-1))
			{
				products +="|";
			}			
			alert(products);
    	}
    	setCookie("shopcart",products);
    	//$(""+pid).style.display = "none";
    	//return products;
    }
    
    
    function saveProduct(pid,products,amt,cid)
    {
    	if(cid==null){cid=0;}
    	if(amt==null){amt=1;}
    
    	var isFind = false;
    	var carts = products.split("|");
    	var i=0;
    	products="";
    	for(;i < carts.length; i++){
			var infos = carts[i].split(",");
			if(infos[0] == pid && infos[1] == cid)
			{
				infos[2] = eval(infos[2])+eval(amt);
				isFind = true;
			}
			products +=infos[0]+","+infos[1]+","+infos[2];
			if(i!==(carts.length-1))
			{
				products +="|";
			}
    	}
    	if(!isFind)
    	{
    		products = products.concat("|"+pid+","+cid+","+amt);
    	}
    	return products;
    }