Change bg images of advert 1 2 and 3?

hello support,

what is best way to change the background images of module positions 1 2 and 3 in the demo template?
these are named /demo_cardio.jpg etc.
and I would like to change these names too for the new images.

thank you.

In template_css.css you will find:

.advertrow .mp_advert1 .cell_pad {
background: url(../images/custom/demo_cardio.jpg) no-repeat;
margin-left: 0;
}

.advertrow .mp_advert2 .cell_pad {
background: url(../images/custom/demo_bodyweight.jpg) no-repeat;
}

.advertrow .mp_advert3 .cell_pad {
background: url(../images/custom/demo_individual.jpg) no-repeat;
margin-right: 0;
margin-left: 18px;
}