selectedTab = new Array();

function select(selectid){
  if(selectedTab[selectid.selectedIndex] == "selected"){
    selectedTab[selectid.selectedIndex] = "";
  }
  else{
    selectedTab[selectid.selectedIndex] = "selected";
  }

  for(var i = 0; i<selectid.length; i++){
    if(selectedTab[i]=="selected"){
      selectid.options[i].selected = true;
    }
    else{
      selectid.options[i].selected = false;
    }
  }
  return 1; 
}