Hello
Pls see the image is using on the our demo http://templates.joomlart.com/ja_mesolite/templates/ja_mesolite/images/bt-addtocart1.gif
1) You create same as this image, it has two part : above part use to display the button when the mouse does not hover and below path use for the mouse hover.
2) To adujst the display position of button pls open the file /templates/ja_mesolite/css/ja.vm.css and try to find codes:
.addtocart_button_module, .notify_button {
padding: 0 0 2px;
width: 102px;
height: 22px;
background: url(../images/bt-addtocart1.gif) no-repeat top #00A9DD;
border: none;
text-indent: 18px;
color: #FFFFFF;
font-weight: bold;
margin-top: 5px;
cursor: pointer;
}
.addtocart_button_module:hover, .addtocart_button_module:active {
background: url(../images/bt-addtocart1.gif) no-repeat bottom #666666;
color: #FFFFFF;
}
http://www.kristarella.com/2009/02/how-to-use-firebug-for-css/
Good luck