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var params = '';
for( var i=0; i<document.FormName.elements.length; i++ )
{
   var fieldName = document.FormName.elements[i].name;
   var fieldValue = document.FormName.elements[i].value;

   // use the fields, put them in a array, etc.

   // or, add them to a key-value pair strings, 
   // as in regular POST

   params += fieldName + '=' + fieldValue + '&';
}

// send the 'params' variable to web service, GET request, ...
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