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<script>
    window.WEBSPELLCHECKER_CONFIG = {
        autoSearch: true,
		lang: 'auto', //enable language auto-detection option
		theme: 'gray', //adjust color theme of WProofreader to look more native to CKEditor 4
		enableAutoSearchIn: ['.cke_wysiwyg_frame'], //limit WProofreader work only to CKEditor 4. They hide the original element and create an iframe element with cke_wysiwyg_frame class.
		...
   };
</script>

<script type="text/javascript" src="http(s)://your_host_name/wscservice/wscbundle/wscbundle.js"></script>