Unsubscribing from a Streaming API Event

1swfobject.registerObject("clippy.codeblock-0", "9");
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17//Unsubscribe from Streaming API events.
18//The PushTopic to unsubscribe from must be passed in.
19Sfdc.canvas(function() {
20    sr = JSON.parse('<%=signedRequestJson%>');
21    Sfdc.canvas.client.unsubscribe(sr.client, {name : 'sfdc.streamingapi',
22        params:{topic:"/topic/InvoiceStatements"}});
23});