Border Spacing and CSS problem

[Azrael Noor]

I am doing this thing

Original

<table width="100%" align="center" height="50" border="0" cellpadding="0" cellspacing="0" leftmargin="0" topmargin="0" valign="top">

</table>

My Changing

.tblmain
{
    width:100%;
    border-spacing:0;
    border:0;
    padding:0;
}

<table class="tblmain" height="50" leftmargin="0" topmargin="0" valign="top">

By Changing it into CSS, The table is becoming slight enlarge, don't know why
am i using some wrong CSS attribute? (i picked border-spacing attribute after googling

[David Newton]

Without knowing what you're trying to accomplish, it's impossible to help My first guess is border-collapse.

[Azrael Noor]

are above concersions appropriate or changing required?

i have made an html
then made scond jsp
calling that html in it,

the whole attributes are roughly written,
so i made css
when i change attribures of .html
the bottom table line is slightily entering into jsp's table