.processing_placeholder {
	display: none;
    position: fixed;
    z-index: 1000;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    background: rgba( 255, 255, 255, .9 ) url('../img/processing.gif') 50% 50% no-repeat;
}

body.processing {
    overflow: hidden;   
}

body.processing .processing_placeholder {
    display: block;
}