I have this for the two divs, I have them in cells of a table to keep them nice, I don't know where to place the invisible style. I actually need the member text field not to be hidden at page load, but when someone changes the select menu to URL then member div should be removed and urlshow should be visible. By the way thank you for your file, I tried even to copy that line into mine but didn't work correctly.
<td><input name="member" type="text" id="ccode" size="40" /></td>
<td><input name="url" type="text" id="url" size="40" /></td>