var prevMailFold="";
var prevMailFoldImg="";
function selectMailFolder(trg){
    if(trg!==null && trg.id){
        if(prevMailFoldImg.length>0){
           prevMailFold.style.backgroundImage=prevMailFoldImg+"_off.gif)";
            ak=prevMailFold.getElementsByTagName("a");
            for (i=0;i<ak.length;i++){
              ak[i].style.color="";
            }
        }
        var kep=trg.style.backgroundImage;
        var torzs=kep.substring(0,kep.lastIndexOf("_"));
        prevMailFold=trg;
        prevMailFoldImg=torzs;
        trg.style.backgroundImage=torzs+"_on.gif)";
        ak=trg.getElementsByTagName("a");
        for (i=0;i<ak.length;i++){
          ak[i].style.color="#333";
        }
    }    
}