java script code in forms library select all states

to select all states  automatically in document library new form.
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<script src="...../SiteAssets/jquery-1.8.3.min.js"></script>

<script>
$(document).ready(function(){

   $(".ms-RadioText[title='Select All'] :checkbox").click(

function(){

   if(this.checked == true) {

       var otherids = (this.id).substring(0, (this.id).length-2 );

       $("input[id^='"+otherids+"']").attr( "checked" , true );

   }

   if(this.checked == false) {

       var otherids = (this.id).substring(0, (this.id).length-2 );

       $("input[id^='"+otherids+"']").attr( "checked" , false );

   }

});

});

   function PreSaveAction()

   {

       $(".ms-RadioText[title='Select All'] :checkbox").attr( "checked" , false );
      $(".ms-RadioText[title='N/A'] :checkbox").attr( "checked" , false );

       return true;


   }

</script>