// redondeo en euros

function redondear(num)
 {
  var num_red
  var num_ent
  var num_dec
  var num_cen
  var dif
  
  for(num_ent=0; num_ent<num; num_ent++);
  if(num_ent>0 && num_ent>num) num_ent--;
  dif = (num - num_ent)*10;
  for(num_dec=0; num_dec<dif; num_dec++);
  if(num_dec>0 && num_dec>dif) num_dec--;
  dif = (dif - num_dec)*10;
  for(num_cen=0; num_cen<dif; num_cen++);
  if(num_cen>0 && num_cen>dif) num_cen--;
  dif = (dif - num_cen)*10;
  if(dif>5)
   if(num_cen<9) num_cen++;
   else 
     {
      num_cen = "";
	  if(num_dec<9)  num_dec++;
	  else 
	   {
		num_dec = 0;
		num_ent++;
	   }
	 }
    if(num_cen!=0)  num_red = num_ent + "." + num_dec + num_cen;
	else 
	 if(num_dec!=0)  num_red = num_ent + "." + num_dec;
	 else num_red = num_ent;
   return(num_red);
 }