These examples are based on the Theme as supplied with the V5 demo site.  
They will only work if your product references are Alphanumeric ( _ and $ are also allowed).

You will have to edit Act_primary.html and Act_ProductBody.html so make backups of them. 

Look in Act_Primary.html for the line

	<FORM METHOD=NETQUOTEVAR:CGIMETHOD ACTION="NETQUOTEVAR:CGIURL" NETQUOTEVAR:ONSUBMIT>

Add this bit of code below it

	<script language=JavaScript>
	 var FormCode = '<FORM METHOD=NETQUOTEVAR:CGIMETHOD ACTION="NETQUOTEVAR:CGIURL" NETQUOTEVAR:ONSUBMIT>';
	</script>

Look in Act_ProductBody.html for the line

	<INPUT TYPE=HIDDEN NAME="PAGE" VALUE="PRODUCT">

Add this bit of code below it

	<script language=JavaScript>
	 FormCode += '<INPUT TYPE=HIDDEN NAME="SID" VALUE="NETQUOTEVAR:SECTIONID"><INPUT TYPE=HIDDEN NAME="PAGE" VALUE="PRODUCT">';
	</script>

Make a new copy of Act_ProductLine.html called PopupProductLine.html

Edit PopupProductLine.html

** look for the line

	<TD COLSPAN="2" ALIGN=LEFT><Actinic:ACTIONS><FONT FACE=ARIAL>NETQUOTEVAR:ADDTOCARTBUTTON</FONT></Actinic:ACTIONS>NETQUOTEVAR:TEMPLATEENDXML</TD>

Replace that with

	<TD COLSPAN="2" ALIGN=LEFT>
           <script language=JavaScript>
                var Actions_NETQUOTEVAR:PRODUCTREFERENCE = FormCode + '<B>NETQUOTEVAR:PRODUCTNAME</B><br>';
                Actions_NETQUOTEVAR:PRODUCTREFERENCE += '<B>NETQUOTEVAR:PRODUCTPRICE</B><br>';
                Actions_NETQUOTEVAR:PRODUCTREFERENCE += '<Actinic:ACTIONS><FONT FACE=ARIAL>NETQUOTEVAR:ADDTOCARTBUTTON</FONT></Actinic:ACTIONS>';
		Actions_NETQUOTEVAR:PRODUCTREFERENCE += '</form>';
		</script>
           <input type=button value="Click Me" 
            onclick="javascript:var w=window.open('','mywin','width=400,height=400,scrollbars=yes,resizable=yes');
             w.document.write(Actions_NETQUOTEVAR:PRODUCTREFERENCE);">
	NETQUOTEVAR:TEMPLATEENDXML
	</TD>

Note your template may have more than one occurence of the line at ** above.  If so, repeat from **.

Now use the PopupProductLine.html template for those products you wish to have a pop-up add to cart page on.