window.onload=function() { attachBehaviors(); }; 
function attachBehaviors () { 
 if (document.getElementById('Username')) { 
  document.getElementById('Username').onfocus=function() { this.value=''; this.style.color="#000000"; }; 
 }
 if (document.getElementById('Password')) { 
  document.getElementById('Password').onfocus=function() { this.value=''; this.type='password'; this.style.color="#000000"; }; 
 } 
}