function abreAlert(texto) {
  document.getElementById("mensaje_alert").innerHTML = texto; 
  document.getElementById("fondo_semi").style.display = "block";
  document.getElementById("ma_content").style.display = "block";

  generaIframe("fondo_semi");

  window.location.href = "#";
}

function cierraAlert() {
  document.getElementById("fondo_semi").style.display = 'none';
  document.getElementById("ma_content").style.display = 'none';

  generaIframe("fondo_semi");
  
  if(document.getElementById("carrito_content")) {
    document.getElementById("carrito_content").style.display = "none";
  }
}

function generaIframe(capa) {
  if(navigator.appName == "Microsoft Internet Explorer") {
    var obj_capa = document.getElementById(capa);
    var obj_iframe_oculto = document.getElementById("iframe_oculto");

    obj_iframe_oculto.style.width = obj_capa.offsetWidth;
    obj_iframe_oculto.style.height = obj_capa.offsetHeight;

    obj_iframe_oculto.style.top = obj_capa.offsetTop;
    obj_iframe_oculto.style.left = obj_capa.offsetLeft;

    if(obj_capa.style.display == "") { obj_capa.style.display = "block"; }
    obj_iframe_oculto.style.display = obj_capa.style.display;
  }
}