function switchdisplay(element_off,element_on)
{
    document.getElementById(element_on).style.display ='';
    document.getElementById(element_off).style.display ='none';
}

function showtip(divID) 
{
    document.getElementById(divID).style.visibility = 'visible';
}

function removetip(divID)
{
    document.getElementById(divID).style.visibility = 'hidden';
}