function mostra_tooltip(id,data,e){
//controllo l'esistenza della div
if(!document.getElementById(id)){
//se non esiste la creo
var tooltip = document.createElement('div');
tooltip.setAttribute('id',id);
document.getElementById('avcon').appendChild(tooltip);
}
var tool = document.getElementById(id);
tool.style.position = 'fixed';
//Internet Explorer necessita di window.event per le coordinate del mouse
if(!e){
 e = window.event;
}
mouseX = e.pageX;
mouseY = e.pageY;
tool.style.top = mouseY-10+'px';
tool.style.left = mouseX+10+'px';
tool.style.opacity = '0.9';
tool.style.border = '1px dashed #842a2a';
tool.style.background = '#d2ba4a';
tool.innerHTML = '<font style="font: verdana; font-size:14px; text-decoration:underline; color:#842a2a;">'+ data +'</font>';
tool.style.display = 'none';
$(id).appear({ duration: 0.5, from: 0.0, to: 0.9 });
}

function elimina_tooltip(id,e){
var tooltip = document.getElementById(id);
$(id).fade({ duration: 0.5, from: 0.9, to: 0.0 });
}