Collapsing image can be set using ob_spl_collapseleft, ob_spl_collapseright classes in the style sheet.
Example: /* for left collapsing */
.ob_spl_collapseleft {
background-image: url('../images/arrow_left.gif');
background-repeat: no-repeat;
background-position: center center;
background-color: white;
border: 1px solid black;
/* for right collapsing */
.ob_spl_collapseright {
background-image: url('../images/arrow_right.gif');
background-repeat: no-repeat;
background-position: center center;
background-color: white;
border: 1px solid black;
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