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).
Actinic generated product references are numeric and thus are OK.

WORK IN PROGRESS - DOES NOT WORK WITH NETSCAPE 
   workaround is to display Add to Cart on product page if Netscape browser.

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 (note the var FormCode.. must be on one long line ending with ;)

	<script language=JavaScript>
	 var FormCode = '<FORM METHOD=NETQUOTEVAR:CGIMETHOD ACTION="NETQUOTEVAR:CGIURL" target="mainwin" onsubmit="window.close();return true;">';
         window.name = 'mainwin';
	</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">';
         var cwin;
	</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 ActStart_NETQUOTEVAR:PRODUCTREFERENCE = FormCode + '<B>NETQUOTEVAR:PRODUCTNAME</B><br>';
            ActStart_NETQUOTEVAR:PRODUCTREFERENCE += '<B>NETQUOTEVAR:PRODUCTPRICE</B><br>';
            ActCart_NETQUOTEVAR:PRODUCTREFERENCE = '<Actinic:ACTIONS><FONT FACE=ARIAL>NETQUOTEVAR:ADDTOCARTBUTTON</FONT></Actinic:ACTIONS>';
	    ActEnd_NETQUOTEVAR:PRODUCTREFERENCE = '<input type=button value="Close" onclick="javascript:window.close()"></form>';
          if ( navigator.appName.indexOf('Microsoft') != -1 )
            {
	    document.write('<input type=button value="Click Me" ', 
             'onclick="javascript:if(cwin && (! cwin.closed))cwin.close();',
             "cwin=window.open('','mywin','width=400,height=400,scrollbars=yes,resizable=yes');",
             'cwin.document.write(ActStart_NETQUOTEVAR:PRODUCTREFERENCE,ActCart_NETQUOTEVAR:PRODUCTREFERENCE,ActEnd_NETQUOTEVAR:PRODUCTREFERENCE);">');
             }
           else
             {
             document.write(ActCart_NETQUOTEVAR:PRODUCTREFERENCE);
             }
	  </script>
	  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.