function current_selected( select_id, option_value ){
 var selectElement = document.getElementById( select_id );
 var selectOptions = selectElement.options;
 for ( var opt, j = 0; opt = selectOptions[j];  j++ ) {
   if (opt.value == option_value) {
      selectElement.selectedIndex = j;
      break;                            
   }                      
 }                  
}  

current_selected( 'select-id', 'current-option' )