// go to top
function backToTop() {
var x1 = x2 = x3 = 0;
var y1 = y2 = y3 = 0;
if (document.documentElement) {
x1 = document.documentElement.scrollLeft || 0;
y1 = document.documentElement.scrollTop || 0;
}
if (document.body) {
x2 = document.body.scrollLeft || 0;
y2 = document.body.scrollTop || 0;
}
x3 = window.scrollX || 0;
y3 = window.scrollY || 0;
var x = Math.max(x1, Math.max(x2, x3));
var y = Math.max(y1, Math.max(y2, y3));
window.scrollTo(Math.floor(x / 2), Math.floor(y / 2));
if (x > 0 || y > 0) {
window.setTimeout("backToTop()", 25);
}
}
// go to top

// ------ exhibitors ------ //
//category on+off
function ShowCBox( boxid ) {
   var target = document.getElementById(boxid);
   if( target.style.display != "block" ) {
      target.style.display = "block";
   }
   else {
      target.style.display = "";
   }
}
function HideCBox( boxid ) {
   var target = document.getElementById(boxid);
   if( target.style.display != "none" ) {
      target.style.display = "none";
   }
   else {
      target.style.display = "";
   }
}