function Trim(s){
   // Remove leading spaces and carriage returns
   while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r')){
      s = s.substring(1,s.length);
   }

   // Remove trailing spaces and carriage returns

   while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r')){
      s = s.substring(0,s.length-1);
   }
   return s;
}

function preload() {
  if (!document.images) return;
  var wl = new Array();
  var arguments = preload.arguments;
  for (var i = 0; i < arguments.length; i++) {
    wl[i] = new Image();
    wl[i].src = arguments[i];
  }
}


function popup(file){
  var l = Math.floor((screen.width-520)/2);
  var t = Math.floor((screen.height-520)/2);
  var prop = "top=0, left=0";
  window.open(file, null, 'width=520,height=520,top='+ t +', left='+ l);
}