#rollover_img_div img {
z-index:1; position:absolute; cursor:pointer; display:none; opacity:0;

-moz-transition-property:opacity, left, top, width, height;
-webkit-transition-property:opacity, left, top, width, height;
-o-transition-property:opacity, left, top, width, height;
-ms-transition-property:opacity, left, top, width, height;
transition-property:opacity, left, top, width, height;

-moz-transition-duration:1s;
-webkit-transition-duration:1s;
-o-transition-duration:1s;
-ms-transition-duration:1s;
transition-duration:1s;

}