You might find it easier to start with the classic template...just replace/copy the classic template files minus the template info file to your iDyeMyHair_template location.
Begin with right clicking and viewing the images or selecting view background image. View properties to obtain the image location & name. If the image type matches yours that you want to replace it with you can just rename yours to the same name as is currently being used and replace it.
The stylesheet controls the site width in
Code:
#mainWrapper {
background-color: #ffffff;
text-align: left;
width: 750px;
vertical-align: top;
border: 1px solid #9a9a9a;
}
There are very few tables associated with Zen Cart
This shuold get you started and other items can be addressed as you need.