function regesc(str) {
    return str.replace(/[-[\]{}()*+?.\\^$|,#\s]/g, "\\$&");
};

function changememe() {
  var tochange = 'my name'; 
  var htmldata;

  if (document.getElementById('hmpu').innerHTML == tochange) {
    document.getElementById('persi').style.visibility = 'invisible'
    document.getElementById('persi').style.display = 'none'
    document.getElementById('hmpu').innerHTML = urlhtml;
    htmldata = document.getElementById('memehtml').innerHTML;
    document.getElementById('memehtml').innerHTML = htmldata.replace(new RegExp(tochange),urlhtmlesc); 
  } else {
    document.getElementById('persi').style.visibility = 'visible'
    document.getElementById('persi').style.display = 'inline'
    document.getElementById('hmpu').innerHTML = tochange;
    htmldata = document.getElementById('memehtml').innerHTML;
    document.getElementById('memehtml').innerHTML = htmldata.replace(new RegExp(regesc(urlhtmlesc)),tochange);
  }
}