td.back 
{ 
   background-color:#FFFFFF; 
   background-image:url(Images/CALogonCentral.jpg); 
   background-repeat:no-repeat;
   width: 100%;
   height: 480px;
}

td.lateral
{
   background-image:url(Images/LogonLateral.jpg);
   background-repeat:repeat-x;
   height: 480px;
}

div.login 
{ 
   position: absolute;
   top: 180px;
   left: 640px;
}