title: before submit event in jqgrid
body: <p>I hav got 2 jquery date picker fields in my form.One for start date and another for end date.
  i want to check whether start date is less than end date . for that i used beforesubmit event5 of jqgrid but how to check it using javascript and am using php as server side lang...
  please answer me as am beginner to jqgrid</p>