function showentry(q){
  var x = document.getElementById(q);
  if (x.className=="cdesc"){
    var y = document.getElementById("pcolloquia");
    if (y) {
      var z = y.getElementsByTagName("tr");
      for(var i=0; i<z.length; i++){
        if (z[i].className =="cdesccurrent")              
          z[i].className = "cdesc";
      }
    }
    var y = document.getElementById("uccolloquia");                  
    var z = y.getElementsByTagName("tr");
    for(var i=0; i<z.length; i++){    
      if (z[i].className =="cdesccurrent")
        z[i].className = "cdesc";
    }
    x.className="cdesccurrent";
  }
  else{
    var y = document.getElementById("pcolloquia");
    if (y) {
      var z = y.getElementsByTagName("tr");
      for(var i=0; i<z.length; i++){       
        if (z[i].className =="cdesccurrent")
          z[i].className = "cdesc";         
      }
    }
    var y = document.getElementById("uccolloquia");
    var z = y.getElementsByTagName("tr");
    for(var i=0; i<z.length; i++){
      if (z[i].className =="cdesccurrent")
        z[i].className = "cdesc";
    }
  }
}