function showHideDiv(show,hide){document.getElementById(hide).style.display='none';document.getElementById(show).style.display='block';}
function showHideSpan(show,hide){document.getElementById(hide).style.visibility='hidden';document.getElementById(show).style.visibility='visible';}
function showDiv(id){document.getElementById(id).style.display='block';}
function hideDiv(id){document.getElementById(id).style.display='none';}