.spinner {     
    position: fixed;     
    top: 50%;     
    left: 50%;     
    margin-left: -50px; /* half width of the spinner gif */    
    margin-top: -50px; /* half height of the spinner gif */    
    text-align:center;     
    z-index:1234;     
    overflow: hidden;     
    width: 170px; /* width of the spinner gif */    
    height: 170px; /*hight of the spinner gif +2px to fix IE8 issue */
}