function verifyEmail(email){
var status = false;     
var emailRegEx = /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i;
     if (email.search(emailRegEx) != -1)
     {
          status = true;
     }
     return status;
}

function checkform(mf)
{
  var error='';
  if(mf.ime.value=="")
  {
    error=error+" - Vnesti morate ime. \n";
  }
  if(mf.email.value=="" && mf.telefon.value=="")
  {
    error=error+" - Vnesti morate email ali telefon. \n";
  }
  if(mf.email.value!="" && verifyEmail(mf.email.value)==false)
  {
    error=error+" - Napaka pri email naslovu. \n";
  }
  if(mf.sporocilo.value=="")
  {
    error=error+" - Vnesti morate sporočilo. \n";
  }
  if (error!="")
  {
    alert("Oprostite, pojavile so se napake:\n"+error);
    return false;
  }
  else
  {
    return true;
  }
}