копируйте код в Ваш CSS(П.У - Дизайн - Управление Дизайном(CSS)).
Code
/* Бирюзовый вариант ajax окон wallaby.ucoz.ru
----------------------------------------------*/
.xt {background:transparent url(http://wallaby.ucoz.ru/_ph/1/2/317086158.png) no-repeat!important; margin-left:5px!important; margin-top:6px!important;}
.xt-close{background-position:0 0!important;}
.xt-close-over{background-position:-15px 0!important;}
.xt-mini{background-position:0 -15px!important;}
.xt-mini-over{background-position:-15px -15px!important;}
.xt-maxi{background-position:0 -30px!important;}
.xt-maxi-over{background-position:-15px -30px!important;}
.xt-rest{background-position:0 -45px!important;}
.xt-rest-over{background-position:-15px -45px!important;}
.xw-hdr { text-align:left!important; padding:0px 5px 0px 0px!important; height:25px!important; }
.xw-hdr-text {font:11px Verdana,Arial,sans-serif!important; font-weight: bold!important; color:#F3F8FE!important; text-shadow: 1px 1px 1px #1f3370!important; vertical-align:3px!important; cursor:default!important; line-height:25px!important; }
.xw-tl {background: url(http://wallaby.ucoz.ru/_ph/1/2/148555351.png) no-repeat left!important;}
.xw-tc {background: url(http://wallaby.ucoz.ru/_ph/1/2/820505718.png) top!important;}
.xw-tr {background: url(http://wallaby.ucoz.ru/_ph/1/2/117430085.png) no-repeat right!important;}
.xw-bl{background: url(http://wallaby.ucoz.ru/_ph/1/2/828382382.png) no-repeat left bottom!important;}
.xw-bc{background: url(http://wallaby.ucoz.ru/_ph/1/2/927781855.png) bottom!important;}
.xw-br{background: url(http://wallaby.ucoz.ru/_ph/1/2/624343446.png) no-repeat right bottom!important;}
.xw-ml{padding-left:0px!important;}
.xw-mr{padding-right:0px!important;}
.xw-plain .xw-mc{ background:#f7f7f7!important; border: 1px solid #429390!important; }
.xw-plain .xw-body{padding:0px!important; border: none!important; }
.myWinCont {padding:10px!important; background: url(http://wallaby.ucoz.ru/_ph/1/2/807076656.png) repeat-x top!important; }
.xw-blank {background:#429390!important;}
/* ------------------------------------------*/
