function validace(formular) {

if(formular.date1.value == "") {
    alert("Error: DATE");
    return false;
  }
  else if(formular.loop.value == "select") {
    alert("Error: LOOP");
    return false;
  }
  else if(formular.name.value == "") {
    alert("Error: NAME");
    return false;
  } 
  else if(formular.passenger.value == "") {
    alert("Error: PASSENGERS");
    return false;
  }
  else if(formular.email.value == "") {
    alert("Error: EMAIL");
    return false;
  } 
  else if(formular.message.value == "") {
    alert("Error: MESSAGE");
    return false;
  } 
  else if (window.RegExp) 
    { 
        znaky=new RegExp("[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}"); 
        if (!znaky.test(formular.email.value)) 
        { 
            alert("Error: EMAIL"); 

            return false; 
        } 
    } 

  return true;
}


function valid(formular) {

if(formular.date1.value == "") {
    alert("Error: DATE");
    return false;
  }
  else if(formular.to.value == "select") {
    alert("Error: TO");
    return false;
  }
  else if(formular.from.value == "select") {
    alert("Error: FROM");
    return false;
  }
  else if(formular.name.value == "") {
    alert("Error: NAME");
    return false;
  } 
  else if(formular.passenger.value == "") {
    alert("Error: PASSENGERS");
    return false;
  }
  else if(formular.email.value == "") {
    alert("Error: EMAIL");
    return false;
  } 
  else if(formular.message.value == "") {
    alert("Error: MESSAGE");
    return false;
  } 
  else if (window.RegExp) 
    { 
        znaky=new RegExp("[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}"); 
        if (!znaky.test(formular.email.value)) 
        { 
            alert("Error: EMAIL"); 

            return false; 
        } 
    } 

  return true;
}



 function v(formular) {

if(formular.name.value == "") {
    alert("Error: NAME");
    return false;
  }
  if(formular.email.value == "") {
    alert("Error: EMAIL");
    return false;
  } 
  if(formular.message.value == "") {
    alert("Error: MESSAGE");
    return false;
  } 
  else if (window.RegExp) 
    { 
        znaky=new RegExp("[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}"); 
        if (!znaky.test(formular.email.value)) 
        { 
            alert("Error: EMAIL"); 

            return false; 
        } 
    } 

  return true;
}