To use the product slider from Mesolite, then you most likely need to add this here into the template.css file for the template you are going to use it in:
/*Slidder Module*/
#ja-slider {
position: relative;
margin-top: 15px;
}
#ja-slider-left {
position: absolute;
left: 0;
top: 0;
width: 30px;
}
#ja-slide-left-img, #ja-slide-right-img , .ja-slide-left-img, .ja-slide-right-img{
position: absolute;
top: 70px;
}
#ja-slider-center, .ja-slider-center {
left: 30px;
height: 165px;
}
#ja-slider-right {
position: absolute;
right: 0;
top: 0;
width: 30px;
}
.jsslide {
white-space: nowrap;
overflow: hidden;
text-align: center;
}
Infact, the easiest for you would be to copy the whole piece of code from this file here:
http://templates.joomlart.com/ja_mesolite/templates/ja_mesolite/css/ja.vm.css
And add to your template.css file and also download the images used and add to the images folder of the template you are using.
Its a start for you,and then please provide a URL for us to see how it looks like.