function pop(str) {
picwin = window.open(str,'pop','scrollbars=yes,resizable=yes,width=650,height=500,status=no,location=no,toolbar=no');
}

function popd(str) {
picwin = window.open(str,'pop','scrollbars=no,resizable=no,width=820,height=440,status=no,location=no,toolbar=no');
}

function menu(id, show) {
if (show == 1) {document.getElementById('menu_'+id).style.display = "";}
if (show == 0) {document.getElementById('menu_'+id).style.display = "none";}
}

function descrizione(show) {
if (show == 1) {document.getElementById('menu_descrizione').style.display = "";}
if (show == 0) {document.getElementById('menu_descrizione').style.display = "none";}
}

function preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.p) d.p=new Array();
    var i,j=d.p.length,a=preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.p[j]=new Image; d.p[j++].src=a[i];}}
}

function swapImgRestore() { //v3.0
  var i,x,a=document.sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function findObj(n, d) { //v3.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=findObj(n,d.layers[i].document); return x;
}

function swapImage() { //v3.0
  var i,j=0,x,a=swapImage.arguments; document.sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=findObj(a[i]))!=null){document.sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

preloadImages('images/bt/register_h.gif','images/bt/login_h.gif','images/bt/logout_h.gif','images/bg_menu.gif');