This is an example of how to use a jquery variable inside a selector

Sync 2 sets of radio buttons

$('form#zaav_a input:radio, form#zaav_b input:radio').click(function(){ 
      
      // store variable class in this variable: 
      whichOne = $(this).attr("class");

      // use variable name as a selector to select twin radio button mark as checked: 
      $('.' +whichOne).attr("checked", "checked");


      getPCS = $('input:radio[name=pcs]:checked').val();
      getYears = $('input:radio[name=years]:checked').val();
      alert('years: '  +getYears+ 'pcs: ' +getPCS);
      $('.button_url').attr({href:'http://www.test.htm?product=ZAAV-'+getYears+'year-'+getPCS+'user'});	
});