function GetPriceUSD(product){
 var price = 0;
 if (product == "tuner4pc") price = 20;
 if (product == "tuner4pc_lite") price = 10;
 if (product == "tuner4pc_stv") price = 6;
 if (product == "skygrabber") price = 24;
 if (product == "langrabber") price = 24;
 if (product == "changekey") price = 1.5;
 if (product == "hdstar") price = 100;
 return price;
}

function GetPriceRUR(product){
 var rate = 30; 
 return GetPriceUSD(product)*rate;
}

function GetPriceWMU(product){
 var rate = 8; 
 return GetPriceUSD(product)*rate;
}


function onChangeVal(oSelect){
  var oForm = document.getElementById('myForm');
  var oPSum = document.getElementById('PSum');
  var oPrSum = document.getElementById('PrSum');
  var oPWallet = document.getElementById('PWallet');
  var oProduct = document.getElementById('product'); 
  var oImage = document.getElementById('pr_box');
  var pvalue = oProduct.value;
  if (pvalue == "tuner4pc_lite" || pvalue == "tuner4pc_stv") pvalue = "tuner4pc"; 
  if (pvalue != "changekey") oImage.src = "../images/box_"+pvalue+".jpg"; 

  oPSum.value = GetPriceUSD(oProduct.value);  
  oPWallet.value = 'Z385716556762';
  if ( oSelect.value == "WMR" || oSelect.value == "WMZ" || oSelect.value == "WMU"){    
    oForm.action = 'https://merchant.webmoney.ru/lmi/payment.asp';    
  } else {
    oPWallet.value = '2138';
    oForm.action = 'https://z-payment.ru/merchant.php';    
  }
  var oSum = document.getElementById('PrSum');
  if (oSelect.value == "WMR"){
    oSum.value = GetPriceRUR(oProduct.value);
    oPWallet.value = 'R192938122847';
  } else if (oSelect.value == "WMU") {
    oSum.value = GetPriceWMU(oProduct.value);
    oPWallet.value = 'U232370228935';
  } else {
    oSum.value = GetPriceUSD(oProduct.value);
  }
  oPSum.value = oSum.value;  
  oPrSum.value = oSum.value;
  var oSum2 = document.getElementById('PrSum2');
  if (oSelect.value == "WMR"){
    oSum2.value = oSum.value + " рублей";
  } else if (oSelect.value == "WMU"){ 
    oSum2.value = oSum.value + " гривен";
  } else {
    oSum2.value = oSum.value + " USD";
  } 
}

function onChangeProduct(oSelect){
  var oSelectVal = document.getElementById('VAL');
  var oNMService = document.getElementById('NMService');
  oNMService.value = 'Оплата за ' + oSelect.value;
  var oPDesc = document.getElementById('PDesc');
  oPDesc.value = 'Оплата за ' + oSelect.value;
  onChangeVal(oSelectVal);
}

function checkmail(value) {
  reg = /[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?/;
  if (!value.match(reg)) {
    alert("Пожалуйста, введите свой настоящий e-mail"); 
    return false; 
  }
}