function show_text(obj,text) {
document.getElementById(obj).className = "context";
document.getElementById(obj).innerHTML="" + text+ "";
document.getElementById(obj).style.visibility="visible";
document.getElementById(obj).style.position="absolute";
/*trail.style.left=event.clientX;
trail.style.top=event.clientY;//*/
}
function hide_text(obj) {
document.getElementById(obj).style.visibility="hidden"
}