Howto add space between nav div and content

Folks,

I'd like to add 4 pixels spacing between the navigation layer on the left and the content. In NN 7 and Firebird 0.6, the content text butts up and touches the nav div. (but not on IE)

I'm not sure how to go about adding space between the nav div and the content text.

The nav div has css of:
#nav {
float: left;
visibility: visible;
border: none;
width: 120px;
color: #000000;
font-size: 12px;
}

It is embedded in the content cell of a main table.

Thankyou if you can help me...

Steve
Perth, Western Australia