var oldeleid="";

function show_focus_text()
{


if(oldeleid!="")
{
var olddiv = document.getElementById(oldeleid);
olddiv.style.display = "none";
}

var dropdownIndex = document.getElementById('category').selectedIndex;
var dropdownValue = document.getElementById('category')[dropdownIndex].value;

var div = document.getElementById(dropdownValue);
div.style.display = "block";

oldeleid= dropdownValue;
}