.bangnoi {
padding:10px;
border-top : 1px solid #FFD7C4;
border-right : 4px solid #0075EA;
border-bottom : 4px solid #0075EA;
border-left : 1px solid #FFD7C4;
background-color: #FFFFE8;

 -moz-border-radius-bottomright: 10px;
 -khtml-border-radius-bottomright: 10px;
 -webkit-border-bottom-right-radius:10px;

 -moz-border-radius-topleft: 10px;
 -khtml-border-radius-topleft: 10px;
 -webkit-border-top-left-radius:10px;

 -moz-border-radius-bottomleft: 10px;
 -khtml-border-radius-bottomleft: 10px;
 -webkit-border-bottom-left-radius:10px;

 -moz-border-radius-topright: 10px;
 -khtml-border-radius-topright: 10px;
 -webkit-border-top-right-radius:10px;
}

<button class="{BUTTON_WYSI_STYLE}" id="text_editor_cmd_switchmode" type="button" title="{SWITCH_EDITOR_MODE}"><img src="{PATH_IMG_FA}i/switch_wysiwyg.gif" alt="{SWITCH_EDITOR_MODE}" /></button>

<button class="button2" onmouseover="helpline('Tạo nền nổi cho văn bản')" onclick="bbfontstyle('[table class = bangnoi ][tr][td][img]http://i29.servimg.com/u/f29/13/89/26/52/icon0110.gif[/img][/td][td]','[/td][/tr][/table]');return false" type="button"><img src="http://i26.servimg.com/u/f26/14/26/60/46/icon0610.gif"></button>