Сегодня я предоставляю на общее скачивание шесть вариантов стиля для ajax окон, главным отличием от других решений является тот момент, что дополнительный код который изменяет внешний вид нашего окна в системе uCoz, мы пропишем в ваши css стили и нам не придётся создавать отдельный css файл и прописывать его после тега </body>, плюс ниже приведённый код не очень большой, если сравнивать его с теми решениями где код достигает размера 15-20 кб, то моё решение намного легче, так как я задействовал только важные значения отвечающие за внешний вид ajax окна.

Синий вариант:

/* Синий вариант ajax окон   
----------------------------------------------*/   
.xt {background:transparent url(http://joomla.ucoz.com/Ajax/5/tool-sprites.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://joomla.ucoz.com/Ajax/5/top_l.png) no-repeat left!important;}   
.xw-tc {background: url(http://joomla.ucoz.com/Ajax/5/top_c.png) top!important;}   
.xw-tr {background: url(http://joomla.ucoz.com/Ajax/5/top_p.png) no-repeat right!important;}   
.xw-bl{background: url(http://joomla.ucoz.com/Ajax/5/bottom_l.png) no-repeat left bottom!important;}   
.xw-bc{background: url(http://joomla.ucoz.com/Ajax/5/bottom_c.png) bottom!important;}   
.xw-br{background: url(http://joomla.ucoz.com/Ajax/5/bottom_p.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 #425693!important; }   
   .xw-plain .xw-body{padding:0px!important; border: none!important; }   
.myWinCont {padding:10px!important; background: url(http://joomla.ucoz.com/Ajax/5/fon_ten.png) repeat-x top!important; }   
.xw-blank {background:#6C84B4!important;}   
/* ------------------------------------------*/

/* Зелёный вариант ajax окон   
----------------------------------------------*/   
.xt {background:transparent url(http://joomla.ucoz.com/Ajax/4/tool-sprites.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://www.center-dm.ru/ucoz/ajax/v1/Green/top_l.png) no-repeat left!important;}   
.xw-tc {background: url(http://joomla.ucoz.com/Ajax/4/top_c.png) top!important;}   
.xw-tr {background: url(http://joomla.ucoz.com/Ajax/4/top_p.png) no-repeat right!important;}   
.xw-bl{background: url(http://joomla.ucoz.com/Ajax/4/bottom_l.png) no-repeat left bottom!important;}   
.xw-bc{background: url(http://joomla.ucoz.com/Ajax/4/bottom_c.png) bottom!important;}   
.xw-br{background: url(http://joomla.ucoz.com/Ajax/4/bottom_p.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 #6cb46d!important; }   
   .xw-plain .xw-body{padding:0px!important; border: none!important; }   
.myWinCont {padding:10px!important; background: url(http://joomla.ucoz.com/Ajax/4/fon_ten.png) repeat-x top!important; }   
.xw-blank {background:#6cb46d!important;}   
/* ------------------------------------------*/

/* Красный вариант ajax окон   
----------------------------------------------*/   
.xt {background:transparent url(http://joomla.ucoz.com/Ajax/3/tool-sprites.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://joomla.ucoz.com/Ajax/3/top_l.png) no-repeat left!important;}   
.xw-tc {background: url(http://joomla.ucoz.com/Ajax/3/top_c.png) top!important;}   
.xw-tr {background: url(http://joomla.ucoz.com/Ajax/3/top_p.png) no-repeat right!important;}   
.xw-bl{background: url(http://joomla.ucoz.com/Ajax/3/bottom_l.png) no-repeat left bottom!important;}   
.xw-bc{background: url(http://joomla.ucoz.com/Ajax/3/bottom_c.png) bottom!important;}   
.xw-br{background: url(http://joomla.ucoz.com/Ajax/3/bottom_p.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 #93424b!important; }   
   .xw-plain .xw-body{padding:0px!important; border: none!important; }   
.myWinCont {padding:10px!important; background: url(http://joomla.ucoz.com/Ajax/3/fon_ten.png) repeat-x top!important; }   
.xw-blank {background:#b46c7a!important;}   
/* ------------------------------------------*/

/* Коричневый вариант ajax окон   
----------------------------------------------*/   
.xt {background:transparent url(http://joomla.ucoz.com/Ajax/2/tool-sprites.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://joomla.ucoz.com/Ajax/2/top_l.png) no-repeat left!important;}   
.xw-tc {background: url(http://joomla.ucoz.com/Ajax/2/top_c.png) top!important;}   
.xw-tr {background: url(http://joomla.ucoz.com/Ajax/2/top_p.png) no-repeat right!important;}   
.xw-bl{background: url(http://joomla.ucoz.com/Ajax/2/bottom_l.png) no-repeat left bottom!important;}   
.xw-bc{background: url(http://joomla.ucoz.com/Ajax/2/bottom_c.png) bottom!important;}   
.xw-br{background: url(http://joomla.ucoz.com/Ajax/2/bottom_p.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 #937f42!important; }   
   .xw-plain .xw-body{padding:0px!important; border: none!important; }   
.myWinCont {padding:10px!important; background: url(http://joomla.ucoz.com/Ajax/2/fon_ten.png) repeat-x top!important; }   
.xw-blank {background:#b49c6c!important;}   
/* ------------------------------------------*/

/* Фиолетовый вариант ajax окон   
----------------------------------------------*/   
.xt {background:transparent url(http://joomla.ucoz.com/Ajax/1/tool-sprites.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://joomla.ucoz.com/Ajax/1/top_l.png) no-repeat left!important;}   
.xw-tc {background: url(http://joomla.ucoz.com/Ajax/1/top_c.png) top!important;}   
.xw-tr {background: url(http://joomla.ucoz.com/Ajax/1/top_p.png) no-repeat right!important;}   
.xw-bl{background: url(http://joomla.ucoz.com/Ajax/1/bottom_l.png) no-repeat left bottom!important;}   
.xw-bc{background: url(http://joomla.ucoz.com/Ajax/1/bottom_c.png) bottom!important;}   
.xw-br{background: url(http://joomla.ucoz.com/Ajax/1/bottom_p.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 #934290!important; }   
.xw-plain .xw-body{padding:0px!important; border: none!important; }   
.myWinCont {padding:10px!important; background: url(http://joomla.ucoz.com/Ajax/1/fon_ten.png) repeat-x top!important; }   
.xw-blank {background:#b06cb4!important;}   
/* ------------------------------------------*/

/* Березовый вариант ajax окон   
----------------------------------------------*/   
.xt {background:transparent url(http://joomla.ucoz.com/Ajax/tool-sprites.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://joomla.ucoz.com/Ajax/top_l.png) no-repeat left!important;}   
.xw-tc {background: url(http://joomla.ucoz.com/Ajax/top_c.png) top!important;}   
.xw-tr {background: url(http://joomla.ucoz.com/Ajax/top_p.png) no-repeat right!important;}   
.xw-bl{background: url(http://joomla.ucoz.com/Ajax/bottom_l.png) no-repeat left bottom!important;}   
.xw-bc{background: url(http://joomla.ucoz.com/Ajax/bottom_c.png) bottom!important;}   
.xw-br{background: url(http://joomla.ucoz.com/Ajax/bottom_p.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://joomla.ucoz.com/Ajax/fon_ten.png) repeat-x top!important; }   
.xw-blank {background:#429390!important;}   
/* ------------------------------------------*/