function OpenPopupWindow(theURL,winName,features) 
{
  window.open(theURL,winName,features);
}

function ChangeImage(img, src)
{
    img.src = src;
}

function check_form1_ru(form) 
{

if (form.elements['airCharge'].value==""){
   form.elements['airCharge'].select();
   form.elements['airCharge'].focus();
   alert ("Необходимо ввести расход воздуха.");
   return false;
  }

if (form.elements['pressure'].value==""){
   form.elements['pressure'].select();
   form.elements['pressure'].focus();
   alert ("Необходимо ввести статическое давление.");
   return false;
  }

if (form.elements['diffuserLength'].value==""){
   form.elements['diffuserLength'].select();
   form.elements['diffuserLength'].focus();
   alert ("Необходимо ввести длину воздуховода.");
   return false;
  }

if (form.elements['person'].value==""){
   form.elements['person'].select();
   form.elements['person'].focus();
   alert ("Необходимо ввести контактное лицо.");
   return false;
  }

if (form.elements['company'].value==""){
   form.elements['company'].select();
   form.elements['company'].focus();
   alert ("Необходимо ввести компанию.");
   return false;
  }

if (form.elements['email'].value==""){
   form.elements['email'].select();
   form.elements['email'].focus();
   alert ("Необходимо ввести e-mail.");
   return false;
  }

return true;
}

function check_form1_en(form) 
{

if (form.elements['airCharge'].value==""){
   form.elements['airCharge'].select();
   form.elements['airCharge'].focus();
   alert ("Enter air flow, please.");
   return false;
  }

if (form.elements['pressure'].value==""){
   form.elements['pressure'].select();
   form.elements['pressure'].focus();
   alert ("Enter overpressure, please.");
   return false;
  }

if (form.elements['diffuserLength'].value==""){
   form.elements['diffuserLength'].select();
   form.elements['diffuserLength'].focus();
   alert ("Enter total diffuser length, please.");
   return false;
  }

if (form.elements['person'].value==""){
   form.elements['person'].select();
   form.elements['person'].focus();
   alert ("Enter contact, please.");
   return false;
  }

if (form.elements['company'].value==""){
   form.elements['company'].select();
   form.elements['company'].focus();
   alert ("Enter company, please.");
   return false;
  }

if (form.elements['email'].value==""){
   form.elements['email'].select();
   form.elements['email'].focus();
   alert ("Enter e-mail, please.");
   return false;
  }

return true;
}