var exchangeRateArray=new Array (1.24,1.41,1,0.77,0.69);
var exchangeNameArray=new Array("CAD","AUD","USD","EUR","GBP");
var exchangeFlagArray=new Array("CA$","AU$","$","€","£");

function addCookie(objName,objValue,objHours){//添加cookie
   var str = objName + "=" + escape(objValue);
   if(objHours > 0){
    var date = new Date();
    var ms = objHours*3600*1000;
    date.setTime(date.getTime() + ms);
    str += "; expires=" + date.toGMTString();
   }
   document.cookie = str;
   //alert("添加cookie成功");
  }
function getCookie(objName){//获取指定名称的cookie的值
   var arrStr = document.cookie.split("; ");
   for(var i = 0;i < arrStr.length;i ++){
    var temp = arrStr[i].split("=");
    if(temp[0] == objName) return unescape(temp[1]);
   }
  }
function initExchangeCookie(){
  //默认为数组第三项
  addCookie("exchange_name",exchangeNameArray[2],"0");
  addCookie("exchange_rate",exchangeRateArray[2],"0");
  addCookie("exchange_flag",exchangeFlagArray[2],"0");
}
function changeCookie(i){
  addCookie("exchange_name",exchangeNameArray[i],"0");
  addCookie("exchange_rate",exchangeRateArray[i],"0");
  addCookie("exchange_flag",exchangeFlagArray[i],"0");
  parent.window.location.reload();
}
function priceUnderRate(p){
  return (getCookie("exchange_rate")*p).toFixed(2);	
}
function addSelectCurrency(selectId){
   var exchange_name=getCookie("exchange_name");
   if (exchange_name==null){
      initExchangeCookie();
	  exchange_name=getCookie("exchange_name");
   }
   for (var i=0;i<exchangeNameArray.length;i++){
      var newop = document.createElement("option");
	  newop.text = exchangeNameArray[i];
	  newop.value = i;  
	  if (exchange_name==newop.text){
	     newop.selected=true;
	  } 
	  document.getElementById(selectId).options.add(newop);
   }
}
function changeSelectCurrency(selectId){
	changeCookie(document.getElementById(selectId).options.selectedIndex);
}