// From: http://onwebdev.blogspot.com/2011/05/serializing-form-without-jquery.html

function serializeForm(form) {

  form = document.getElementById(form) || document.forms[0];
  var elems = form.elements;
  
  var serialized = [], i, len = elems.length, str='';
  
  for(i = 0; i < len; i += 1) {
  
    var element = elems[i];
    var type = element.type;
    var name = element.name;
    var value = element.value;
    
    switch(type) {
    
      case 'text':
      case 'radio':
      case 'checkbox':
      case 'textarea':
      case 'select-one':
      
      str = name + '=' + value;
      
      serialized.push(str);
      
      break;
      
      default:
      
      
        break;
        
    }    
  
  }
  
  return serialized.join('&');

}