passing list item id as workflow parameter without code

Question

Hi, I am using Sharepoint Designer 2010 and in there am trying to build an aspx wiki page with dataviewwebpart which will display a list. In this view I wish to have a button against each list item which would trigger a workflow for that list item. Upon searching I got to gather that I need to pass the list item id as a workflow parameter. This link http://spforsquirrels.blogspot.com/2008/03/follow-up-training-classes-scheduling.html talks about achieving that by modifying the onclick event js of the button.

Workflow parameter name is MachineID

The javascript generated for my form action control is

javascript:{ddwrt:GenFireServerEvent('__workflowStart={,,{FBE64AF7-5A72-43E0-8339-293FD3ADFD37},}')}

and to accommodate it to pass the workflow variable the site said to modify it this way

javascript:{ddwrt:GenFireServerEvent(concat('__workflowStart={{FBE64AF7-5A72-43E0-8339-293FD3ADFD37},New,{66402E3B-C94E-4E6F-9936-10E596CC5795},MachineID=',@ID, '};'))}

but as the parameter New,{66402E3B-C94E-4E6F-9936-10E596CC5795} is unknown to me and also didn’t get generated for me, I used the following JS.

javascript: {ddwrt:GenFireServerEvent(concat('__workflowStart={{FBE64AF7-5A72-43E0-8339-293FD3ADFD37},MachineID=',@ID, '};'))} 

but this doesn’t trigger the workflow.What am i doing wrong?