{border-spacing:}
The {border-spacing:} property sets the spacing between adjacent table cells' borders using the separated borders model. If the collapsing borders model is used, the {border-spacing:} property is ignored.
Note that the distance between a cell border and the table border is the corresponding border spacing plus the table's {padding:} for that side.
The CSS2.1 specification states that user agents may apply The {border-spacing:} property to <frameset> elements (therefore replacing the framespacing=""> attribute).
Negative values are not allowed.
The {border-spacing:} can be specified using one or two length values. If two values are given, the first sets the horizontal spacing, and the second sets the vertical spacing. If only one value is given, it sets both the horizontal and vertical spacing to the specified value.
Internet Explorer for Windows versions up to and including 7 do not support the {border-spacing:} property.