changed the css to add the correct url to the image.
<div title='{{divTitle}}' id='{{id}}'
class='ui-slider-range ui-slider-range-min ui-widget-header Ldt-iri-chapter'
style='left: {{startPourcent}}%; width: {{endPourcent}}%; padding-top:15px; border-left:solid 1px #aaaaaa; border-right:solid 1px #aaaaaa; background:#{{hexa_color}};'
>
</div>