Código:

$(function(){if($('input#username_reg').length){$('input#username_reg').keyup(function(){if($('#username_reg').attr('value')==''){$('input#username_reg').removeClass('okusername')}else{url='/search?mode=searchuser&fieldname=username&search_username='+encodeURIComponent($('input#username_reg').val());$.get(url,function(data){if($('select[name=username_list] option',data).val().toLowerCase()==$('input#username_reg').val().toLowerCase()){$('input#username_reg').removeClass('okusername')}else{$('input#username_reg').addClass('okusername')}})}})}});

div.topic-title-container {
display: inline;
font-size: 12px;
text-align: center;
}
#page-header #search-box {
display: none;
}
em{
font-style: normal;
}


.module .postbody .postbody-head {
background-color: #e5e6e7;
}

.post-footer {
background-color: #CCCCCC;
}

.post .post-header {
background-color: #CCCCCC;
}




.headerbar {margin-bottom:0;}

blockquote {
background-color:#CCCCCC;
}

ul.linklist li a img {
filter:alpha(opacity=30);
-moz-opacity: 0.3;
opacity: 0.3;
}
ul.linklist li a img:hover {
filter:alpha(opacity=100);
-moz-opacity: 1.0;
opacity: 1.0;
cursor:allowed;
}

a {

outline: none;

}

#username_reg {
border:2px solid red!important;
}
#username_reg.okusername {
border:2px solid green!important;
}

Spoiler:

#username_reg {
border:2px solid red!important;
}
#username_reg.okusername {
border:2px solid green!important;
}

powernfx escreveu:A questao e que eu mudei para phpbb 2 e funfo, acho que em phpbb 3 nun pega.