Dodgy coding?

[Eccentric]

Edit: didnt realise css cant start with numbers !
SORTED!!!!

.153pxhead {
background-image: url(images/153px_header_green.gif);
width: 155px;
height: 9px;
background-repeat: no-repeat;
background-position: center;
}
.155pxbody {
background-image: url(images/155px_body_green.PNG);
width: 155px;
background-repeat: repeat-y;
text-align: center;
}
.153pxbottom {
background-image:url(images/153px_bottom_green.gif);
background-repeat:no-repeat;
background-position:center;
height:9px;
width: 155px;
margin-bottom: 3px;
}

My css, but it actually doesnt work :| i am stumped ! ideas? it just doesnt do exactly what it says basically.