function trim(str) 
{
  return ltrim(rtrim(str));
}

function ltrim(str) 
{
  var resultstr = "";
  var i;
  for( i = 0; (i < str.length) && (str.charAt(i) == " "); i++) ;
  while (i < str.length) {
      resultstr += str.charAt(i); 
      i++;
  }
  return resultstr
}

function rtrim(str)
{
  var resultstr = ""
      
  for(i = str.length-1; (i > -1) && (str.charAt(i) == " "); i--);
  while (i > -1) 
  {
      resultstr = str.charAt(i) + resultstr; 
      i--;
  }
  return resultstr
}

function ponfoco(d) 
{
  d.focus();
  
}

function checkemail(email)
{ 
  var ind1, ind2, ind3; 
  ind1 = email.indexOf('@'); 
  ind2 = email.indexOf('.'); 
  ind3 = email.lastIndexOf('@'); 
  
  if ((ind1<=0) || (ind2<ind1) || (ind3 != ind1)) 
    return false; 
  else 
    return true;
  
  
}


function compCampos(formulario,txt1,txt2,txt3,nomComboMarca)
{
  
  var Caducidad = "";
  var year = "";
  var mes ="";
  
  year = (document.formulario.elyear.options[document.formulario.elyear.selectedIndex].value);
  mes = (document.formulario.elmes.options[document.formulario.elmes.selectedIndex].value);
  formulario.PAN.value=trim(formulario.PAN.value);
  Caducidad=year + mes;
  Caducidad=trim(Caducidad);
  formulario.Caducidad.value=Caducidad;  
  
  var nom='formulario.'+nomComboMarca+'.value';
  
  
  if ((formulario.PAN.value=="") || (formulario.PHONE.value=="")|| (formulario.EMAIL.value=="") || (formulario.HDMNC.value=="") || (eval(nom)==""))  
  {
    alert(txt1);    
    ponfoco(document.formulario.PHONE);
    
    return false;
  }  
  else if ((!checkemail(formulario.EMAIL.value)) || isNaN(formulario.PHONE.value) || isNaN(formulario.PAN.value) || (isNaN(mes)) || (isNaN(year)) || document.formulario.elyear.selectedIndex==0 || document.formulario.elmes.selectedIndex==0)
  {
    alert(txt3);
    if (isNaN(formulario.PHONE.value))
      ponfoco(document.formulario.PHONE);
    else if (!checkemail(formulario.EMAIL.value))
      ponfoco(document.formulario.EMAIL);
    else
      ponfoco(document.formulario.PAN);
      
    return false;
  }
  
  formulario.cmdProceder.value = txt2;
  formulario.cmdProceder.disabled = true;

  return true;
}


function compCamposPAYPAL(formulario,txt1,txt2,txt3,nomComboMarca)
{
  
  var nom='formulario.'+nomComboMarca+'.value';
  
  formulario.EMAIL.value=trim(formulario.EMAIL.value);
  
  if ((formulario.PHONE.value=="") || (formulario.EMAIL.value=="") || (formulario.HDMNC.value=="") || (eval(nom)==""))  
  {
    alert(txt1);    
    
    return false;
  }  
  else if ((!checkemail(formulario.EMAIL.value)) || isNaN(formulario.PHONE.value))
  {
    alert(txt3);
    if (isNaN(formulario.PHONE.value))
      ponfoco(document.formulario.PHONE);
    else (!checkemail(formulario.EMAIL.value))
      ponfoco(document.formulario.EMAIL);
    
    return false;
  }
  
  formulario.cmdProceder.value = txt2;
  formulario.cmdProceder.disabled = true;

  return true;
}

function compCamposPopup(formulario,txt)
{
  
  formulario.CMBMNC.value=trim(formulario.CMBMNC.value);
  formulario.CMBMARCAS.value=trim(formulario.CMBMARCAS.value);
  if ((formulario.CMBMNC.value=="") || (formulario.CMBMARCAS.value==""))
  {
    alert(txt);    
    return false;
  }
  
  
  return true;
}