function $(id){
 return document.getElementById(id);
}
function mainnavigationover(obj){
   
    var spans = obj.childNodes;
   
    if( spans[0].innerHTML.length == 2){
        obj.className = "navigation_main_on";
    }else{
         obj.className = "navigation_else_on";
    }
    
}
function mainnavigationout(obj){
    var spans = obj.childNodes;
    if( spans[0].innerHTML.length == 2){
        obj.className = "navigation_main_off";
    }else{
         obj.className = "navigation_else_off";
    }
}