jQuery Method To Prompt A User To Save Changes Before Leaving Page

var isDirty = false;

isDirty = true;

var confirmExit = confirm(‘Are you sure? You haven\’t saved your changes. Click OK to leave or Cancel to go back and save your changes.’);
return true;
return false;

ref : http://cfsilence.com/blog/client/index.cfm/2009/10/12/jQuery-Method-To-Prompt-A-User-To-Save-Changes-Before-Leaving-Page

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