Vertical lines in tables are not exposed. How to fix it?

Hello!

Ive got a problem, that is evident from the post title. Whatever table i create or paste into my posts or pages they are always composed of just horizontal lines with no vertical ones. The latter are invisible. Ive tried to fix it on myself, but it was useless. Can you help me?

This is the ccs-code from my style css-file, that i tried to fix:
==============================================
.entry table {
border: 1px solid #000000;
background-color: #f9f9f9;
width: 100%;
-moz-border-radius: 3px;
-webkit-border-radius: 3px;
border-radius: 3px;
font-family: Arial,”Bitstream Vera Sans”,Helvetica,Verdana,sans-serif;
color: #f9f9f9;
border-collapse: collapse;
border-spacing: 0;
}
.entry table td,.entry table th { border-top: 1px solid black;border-bottom: 1px solid #000000;color: #000000;}
.entry table th {
text-shadow: 0 1px 0 #fff;
font-family: Georgia,”Times New Roman”,”Bitstream Charter”,Times,serif;
font-weight: normal;
padding: 7px 7px 8px;
text-align: center;
line-height: 1.3em;
font-size: 14px;
}
.entry table td {font-size: 12px;padding: 4px 7px 4px;vertical-align: top;}
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