Accessing a sharepoint web service provinding a sharepoint field data as a input parameter

Question

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I am trying to provide an input parameter to a sharepoint webservice through a sharepoint fornm field in my list. but if i use the id of the input field it doesn't pass anything. I have a Sharepoint Field named PVR NUMBER whose id is "ff1{$Pos}" i need to pass the value of this field to the webservice i am not able to do it till now. anyone can help me out here.........<soap:Envelope xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema' xmlns:soap='http://schemas.xmlsoap.org/soap/envelope/'&gt; \ <soap:Body> \ <HelloToYou xmlns='http://tempuri.org/'&gt; \ <name>"+$("**#ff1{$Pos}**").val() +"</name> \ </HelloToYou> \ </soap:Body> \ </soap:Envelope>";