HTML/JSP/JAVASCRIPT help

I have a JSP page where I load an arraylist which has the list of fields to be displayed.If the arrayList has nothing I will not load any inputbox else create as many input boxes as there are in arraylist which is done correctly.I keep a name field1,field2,field3...fieldn where n is the size of the array.Now When I submit my form I should check whether the value of these fields are not empty or null and should alert the user that if the fields are blank.I can use only js and no RIA or AJAX. Can anyone help me in this issue?

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