function UnLockScreen()
{
    var lock = document.getElementById('ctl00_panLockScreen');         
    if(lock)
      lock.className = 'LockOff';       
}

function LockScreen(msg, height)
{
    var lock = document.getElementById('ctl00_panLockScreen');         
    if(lock)
        lock.className = 'LockOn';  
        
    var waitMsg = document.getElementById('ctl00_waitText'); 
    if(waitMsg)
        waitMsg.innerHTML = msg;
}