function inputFocus() {
   
   var inputs = document.getElementsByTagName('input');
   for (var i=0; i<inputs.length; i++) {
      inputs[i].onfocus = function() { this.className = 'focused' }
      inputs[i].onblur = function() { this.className = '' }
   } 
   var textareas = document.getElementsByTagName('textarea');
   for (var i=0; i<textareas.length; i++) {
      textareas[i].onfocus = function() { this.className = 'focused' }
      textareas[i].onblur = function() { this.className = '' }
   } 
}