Pass Parent ID to Related List NewForm

I have a "parent" list and a "child" list.  The child list has a lookup to a column in the parent list. I've placed a Related Item View on the parent list DispForm.

When a user is viewing the DispForm, they can click Add New in the Related Item view, to add a new child item.  But the value of the parent item is not passed to the child NewForm.

Any suggestions on how to achieve this (I do have SPD).

Many thanks.
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TEEDAAsked:
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dp_expertCommented:
Use javascript to get the ID from the URL and add to the URL of the "Add new item" link "?parentID=<id from url>".

Next use SPD to modify the newform.aspx. Use javascript  to read the parentID from url and then set the field to this value. Depending on the field you are using there will be different methods to achieve this - if you are using a single choice lookup field, then use this script (remember to input the ID of your field):

<script language="javascript" type="text/javascript">
parentID=window.location.href.split("parentID=")[1].split("&")[0];

_spBodyOnLoadFunctionNames.push("fillDefaultValues");

function fillDefaultValues(){
  var clInputId = "<ID of the INPUT FIELD>";//here input ID of the field
  value = parentID;

  var clInput = document.getElementById(clInputId);
  clInput.value = value;

  ShowDropdown(clInputId);

  var select=document.getElementById(clInput.opt);
  if (select != null){
   var opts = select.options;
   var l = opts.length;	
   for (var i=0; i < l; i++) {
      if (opts[i].text == value) {
        select.selectedIndex = i;
        break;
      }
   }
   OptLoseFocus(select);
  }
}</script>

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