var Iist = 1;
var NumRecord = numero_visualizar_menu;
var Iend = NumRecord;
var curRecord = 1;
var debug = false;

function showPrev(num) {
  Iist -= num;
  Iend -= num;
  curRecord = Iist;
  
  if (Iist<=1) {
    Iist = 1; 
    Iend = NumRecord;
  }
  changeAppearance();
  if (debug) alert("Iist = " + Iist + " and Iend = " + Iend);
}
function showNext(num) {
  Iist += num;
  Iend += num;
  curRecord = Iist;
  if (Iend >= MaxRecord) {
    Iist = MaxRecord - NumRecord + 1; 
    Iend = MaxRecord;
  }
  changeAppearance();
  if (debug) alert("Iist = " + Iist + " and Iend = " + Iend);
}
function changeAppearance() {
	for (i=1;i<MaxRecord+1;i++){ 
		if (i >= Iist && i <= Iend){
			eval('objLine'+i+'.style.display = "inline";');
			eval('objSpan'+i+'.style.display = "inline";');
  		}else {
			eval('objLine'+i+'.style.display = "none";');
			eval('objSpan'+i+'.style.display = "none";');
		}
	}
}

function changeNumRecord(mostrar) {
	Iist = 1;
	if (mostrar == 'TODAS'){
		NumRecord = MaxRecord;
	}else{
		NumRecord = mostrar;
	}
	Iend = NumRecord;
	curRecord = 1;

	for (i=1;i<MaxRecord+1;i++){ 
		if (i >= Iist && i <= Iend){
			eval('objLine'+i+'.style.display = "inline";');
			eval('objSpan'+i+'.style.display = "inline";');
  		}else {
			eval('objLine'+i+'.style.display = "none";');
			eval('objSpan'+i+'.style.display = "none";');
		}
	}
	if (NumRecord >=MaxRecord){
		objSelector.style.display = "none";
	}else{
		objSelector.style.display = "inline";
	}
}