Unique values required

This short script validates that each input with class UNIQUE have unique values per form.

HTML

<form action="#" id="moduleselectForm">
<div class="success" style="display:none;color:#00FF00;">Form Submitted !!</div>
<div class="error" style="display:none;color:#FF0000;">Unique values required</div>
<input class="unique" value="a" /><br/>
<input class="unique" value="a" /><br/>
<input class="unique" value="a" /><br/>
<input type="submit" value="submit" />
</form>

JavaScript

$(function(){
        $('#moduleselectForm').submit(function(evt){
            evt.preventDefault();
            var hashTable=new Array();
            var valid =true;
            $('input.unique','#moduleselectForm').each(function(index,item){
                $('.error').hide();  
                $('.success').hide();   
                var itemVal =$(item).val();
                if($.inArray(itemVal,hashTable)==-1)
                {
                    hashTable.push(itemVal);
                }
                else{
                    valid=false;   
                    return false;
                }
            });
            if(valid)
            {
                $('.success').show();  
            }else{
                $('.error').show();
            }
        });
    
    });