function submenuOpenClose(tab_number) {
  var i = 1;
  for(i=1; i<=2; i++) {
    if (i == tab_number){
      document.getElementById('tab_' + i).style.display='block';
    }

    else {
      document.getElementById('tab_' + i).style.display='none';
    }
  }
}

function isNumeric(number) {
    //Because number is not a string.
    number = number + ''; 
    if(number.indexOf(".") == -1) return true;
    else return false;
}

function deleteKeywordText() {
    if (document.getElementById('keyword').value == conf_keyword_message) {
      document.getElementById('keyword').value='';
    }
}

function replaceSpecialCharacters() {
    var string = document.getElementById('keyword').value;
    
    string = string.replace(/"/g, '');
    string = string.replace(/'/g, '');
    string = string.replace(/</g, '');
    string = string.replace(/>/g, '');
    
    document.getElementById('keyword').value = string;
}