function move_up(str) {
var xmlhttp;
   try {
      xmlhttp=new XMLHttpRequest();
   }
   catch (e) {
      try {
         xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
         catch (e) {
         try {
            xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
         }
         catch (e) {
            alert("You may want to consider upgrading your obsolete internet browser...");
            return false;
         }
      }
   }
   var url='manage.php?do='+str;
   document.getElementById('c_1').innerHTML=xmlhttp.responseText;
   xmlhttp.open("GET",url,true);
   xmlhttp.send(null);
}