kristow,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
span{
cursor: pointer;
}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script>
$(function(){
$(document).on('click', '[class*="modal_btn"]', function(){
var id = '#small-modal'+this.className.replace(/^.*modal_btn([^\s]+).*?$/, '$1')
alert(id)
//$(id).arcticmodal();
});
});
</script>
</head>
<body>
<span class="modal_btn-01 test">-01</span>
<span class="red modal_btnnew">new</span>
<span class="modal_btn03">03</span>
<span class="modal_btn04">04</span>
<span class="modal_btn05">05</span>
<span class="modal_btn06">06</span>
<span class="modal_btn07">07</span>
<span class="modal_btn08">08</span>
<span class="modal_btn09">09</span>
<span class="modal_btn10">10</span>
</body>
</html>