if (document.images) {
header = new Image(485, 113);header.src = 'images/header.jpg';
sigmalogo = new Image(113, 113);sigmalogo.src = 'images/sigmalogo.jpg';
headermid = new Image(2, 113);headermid.src = 'images/headermid.jpg';
c = new Image(2, 113);c.src = 'images/c.gif';
sigmalogoghost = new Image(150, 150);sigmalogoghost.src = 'images/sigmalogoghost.jpg';
line = new Image(2, 2);line.src = 'images/line.gif';
spacer = new Image(1, 1);spacer.src = 'images/spacer.gif';
}
function di(id,name){
  if (document.images) {document.images[id].src=eval(name+".src"); }
}
// function that displays status bar message

function dm(msgStr) {
  document.returnValue = false;
  if (document.images) { 
     window.status = msgStr;
     document.returnValue = true;
  }
}
var showMsg = navigator.userAgent != "Mozilla/4.0 (compatible; MSIE 4.0; Mac_PowerPC)";
function dmim(msgStr) {
  document.returnValue = false;
  if (showMsg) { 
    window.status = msgStr;
    document.returnValue = true;
  }
}
function stopSpam() {
  var displaytext = "Click here";
  var mail1 = "sigma";
  var mail2 = "mailshack.com";
  var subject = "?subject=Message%20to%20Sigma";
  document.write("<a href=" + "mail" + "to:" + mail1 + "@" + mail2 + subject + ">" + displaytext + "</a>")
}