[cgrant]

Are you talking about displaying your product list in 4x1 row instead of the default 1x1 rows? If so, this is built into x-cart already. What you do is go General Settings => Appearance Options, then in the spot that says "Display products list in multiple columns (1-3) (leave empty to use standard format):"
Enter how many you want. Also make sure the option below it that says "Display only featured products list in multicolumn format:" does not have a check in it or it will only display on your featured products list.