problema footer

[janas]

sera a tutti,
non riesco a fare in modo che il footer sia sempre a fondo pagina.
Ho seguito, le indicazioni riportate nella guida css di questo sito, ma è per un layout ad una colonna e non son riuscito ad adattarlo al mio che è a tre colonne. grazie a tutti in anticipo.

file css

HTML {
PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px;
height:100%;
}
BODY {
PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; MARGIN: 0px; PADDING-TOP: 0px;
height:100%;
}
BODY {
FONT-SIZE: 76%; FONT-FAMILY: arial,sans-serif; TEXT-ALIGN: center
}

DIV#container {
MARGIN: 0px auto; WIDTH: 778px; TEXT-ALIGN: left;
position: relative; height:auto; min-height:100%;
}

DIV#testata {
width: 100%;
height: 100px;
background-image: url(img/testataok.jpg);
background-repeat: no-repeat;
}

DIV#menu {
position:relative;
top:32px;
left:310px;
widht:150px;
height:20px;

}

DIV#menu a:link {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 11px;
font-weight: bold;
color: #999999;
padding-right: 20px;
text-decoration: none;
}
DIV#menu a:visited {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 11px;
font-weight: bold;
color: #999999;
padding-right: 20px;
text-decoration: underline;
}

DIV#menu2{
position:relative;
top:20px; left:310px; widht:150px; height:20px;}

DIV#menu2 a:link {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 11px; font-weight: bold; color: #FFCC33;
padding-right: 20px; text-decoration: none;}

DIV#menu2 a:visited {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 11px; font-weight: bold; color: #FFCC33;
padding-right: 20px; text-decoration: underline;}

DIV#loginout {
position:relative;
top:20px; left:310px; widht:150px;
}

DIV#data {float:right; margin-top:3px; margin-right:5px;}

DIV#logout {float:right; margin-top:7px; margin-right:23px;}

.campo {
border: 1px solid #999999;
}

/* sezione contenuti */

DIV#centro {
float:left; width: 472px; margin-top:10px;
}
DIV#centro form {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 10px;
color: #999999;
font-weight: bold;
text-align: center;
background-image: url(img/fondo_form.jpg); background-repeat: no-repeat;
padding-top:5px; padding-bottom:5px;
}
DIV#sinistra {
float:left;
width: 150px;
margin-top:10px;
}
DIV#destra {
float:right;
width: 150px;
margin-top:10px;
}

.testatina {
width:150;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 12px;
font-weight: bold;
text-align: center;
color: #ffffff;
height: 25px;
background-image: url(img/testatina.jpg);
background-repeat: no-repeat;
background-position: top;
padding-top: 12px;
}

.links {
width:133px;
padding:5px;
margin-top:5px; margin-bottom:5px;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 10px;
font-weight: bold;
color: #000000;
background-color: #f3f3f3;
border-bottom-width: 1px;
border-bottom-style: solid;
border-bottom-color: #CCCCCC;
}
/* fine contenuti*/
DIV#footer {
position:relative; bottom:0px; width:100%;

PADDING-TOP: 5px;
padding-bottom:5px;
TEXT-ALIGN: center;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 9px;
color: #999999;
border-top-width: 1px;
border-top-style: solid;
border-top-color: #000000;
font-weight: normal;
}
DIV#footer A {
padding-right:5px;
FONT-WEIGHT: normal;
COLOR: #999999;
TEXT-DECORATION: none;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 9px;
line-height: 20px;
}

DIV#footer A:visited {
FONT-WEIGHT: normal;
COLOR: #999999;
TEXT-DECORATION: underline;
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 9px;
line-height: 20px;
}

[janas]

abbiate pazienza

[janas]