Discount = 0.65;
$(function(){ 
	init();
	$("select").change(function(){init()}); 
	$(".Discount").html(Discount*100 + "%");
 });
var init = function(){
	//change table class name
	var tb = $(document).find(".multicart");
	var tbCount = tb.length;
	for(j=0; j<tbCount;j++){
		var tr = $(tb[j]).find("tr");
		var trCount = tr.length;
		var Gross_Amount = 0;
		for(i=1;i<trCount-1;i++){
			Gross_Amount = Gross_Amount + Number($($(tr[i]).find("select")[0]).val());
		}
		var GA = $(tb[j]).find(".GrossAmount");
		var NA = $(tb[j]).find(".NetAmount");
		$(GA[0]).html(Gross_Amount);
		$(NA[0]).html(ForDight(Gross_Amount*Discount,2));
	}
}
function show(obj, title){
	var tr = $(obj).parent().parent().parent().find("tr");
	var trCount = tr.length;
	var selectVal = "";
	var Gross_Amount = 0;
	for(i=1;i<trCount-1;i++){
		var val = $($(tr[i]).find("select")[0]).val();
		if(val != ""){
			selectVal = selectVal + val  + ",";
			Gross_Amount = Gross_Amount + Number(val);
		}
	}
	buyItem(title, ForDight(Gross_Amount*Discount,2), 1, "(" + selectVal + ")");
	//alert(title + "(" + selectVal + ")");
	//alert(Gross_Amount*Discount);
}

function addSingle(obj, title){
	var select = $(obj).parent().parent().parent().find("select");
	var selectVal = $(select).val();
	buyItem(title, selectVal , 1, "(" + selectVal + ")");
}

//增加的函数
function  ForDight(Dight,How)  
{  
      	Dight  =  Math.round  (Dight*Math.pow(10,How))/Math.pow(10,How);  
      	return  Dight;  
}