function doIt(theValue) 
{
document.getElementById("timetable").style.display = (( theValue=="1")?"block":"none"); //"none"
} 

function doIt2(theValue) 
{
document.getElementById("timetable0").style.display = (( theValue=="1")?"block":"none"); //"none"
document.getElementById("timetable").style.display = (( theValue=="1")?"block":"none"); //"none"
document.getElementById("timetable2").style.display = (( theValue=="1")?"block":"none"); //"none"
document.getElementById("timetable3").style.display = (( theValue=="1")?"block":"none"); //"none"
}