borders are not visible in ie7

Question

i want a border on bottom of a td.i got that using border:dotted 1px black;.but it is not visible in ie7.the td height is 10px.if i use &nbsp it is visible in ie7.but i dont need that much height.can anyone help me? Here My Code

Untitled Document

Answer 1

table {
 border-collapse: collapse;
}