dynamic css table border

[doutsos]

Hi, new to web-developing and new to BYTES, so so please dont be strict!

I am trying to create a table dynamicly and I put in several rows:

for( int bla bla){
<tr style="border-top:1px solid black">
<td>bla bla<td>
<tr>
}

works almost fine in Chrome,Opera but in Firefox some rows have no border (depends in the resolution) and in IE there are no rows at all.

Thanks..