isInConsole()

1<apex:page standardController="Case">
2    <A HREF="#" onClick="testIsInConsole();return false">
3         Click here to check if the page is in the Service Cloud console</A> 
4
5    <apex:includeScript value="/support/console/65.0/integration.js"/>
6    <script type="text/javascript">
7        function testIsInConsole() {
8            if (sforce.console.isInConsole()) {
9                  alert('in console');
10               } else {
11                  alert('not in console');
12            }
13        }
14    </script>
15</apex:page>