/* Вид кнопки как "В контакте" от ext1on.my1.ru */
.button_blue{text-align: center;-webkit-border-radius: 2px;-khtml-border-radius: 2px;-moz-border-radius: 2px;border-radius: 2px;display: inline-block;*display: inline;position: relative;line-height: normal;zoom: 1;}
.button_blue button {border: 1px solid;background: none;font-size: 11px;margin: 0px;cursor: pointer;white-space: nowrap;outline: none;padding: 4px 14px;*padding: 5px 15px 3px;font-family: tahoma, verdana, arial, sans-serif, Lucida Sans;overflow: visible;}
.button_blue button::-moz-focus-inner, .button_gray button::-moz-focus-inner {border: 0;}
.button_blue {border: 1px solid #4e6f93;border-top-color: #517295;background: #5D81A7;}
.button_blue button {border-top-color: #789ABF;border-bottom-color: #5980A9;border-left-color: #5980A9;border-right-color: #5980A9;color: #FFF;text-shadow:0 1px 0 #45688E;*border: 0;background: url(http://st0.userapi.com/images/button_vk.png) #6181a6 repeat-x top;background-position: 0px -16px;*background-position: 0px -16px;}
.button_blue button:hover, .button_blue button.hover {background-position: 0px -8px;}
.button_blue button:active, .button_blue button.active {background: #5e80a5;border: 1px solid #5e80a5;position:relative;}
/* Вид кнопки как "В контакте" от ext1on.my1.ru */

<div class="button_blue"><button id="send_post" >Отправить</button></div>