function combldClass(form1)
  {
      form1.CLASS.value = ""
      for( i = 2; i < 8; i++ )
      {
        if( form1.elements[i].checked == true ) 
        { 
          if( form1.CLASS.value == "" ) { form1.CLASS.value = form1.elements[i].value }
          else { form1.CLASS.value += " "+form1.elements[i].value }
        }
      }
  }