Batyabest,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
#choiseFunc+ span:after{
margin-left: 8px;
content: "Сравнить" ;
}
#choiseFunc:checked + span:after{
content: "В сравнении";
}
</style>
</head>
<body>
<label id="srav">
<input type="checkbox" value="1052" id="choiseFunc"/><span></span></label>
</body>
</html>