Hi,

You have to put som JavaScript code in your HtmlPage.
This code will update a javascript boolean variable which said if someone allready 
clicked on the button.
Here is the code :
"var clicEffectue=false;
function verifClicEffectue(){
 form=window.document.forms[0];
 if (clicEffectue) {
  alert("clic deja effectue");
  return false;
 }
 else {
  clicEffectue=true;
  return true;
 }
}"
You have to call this code on the "onClick" javascript event on your button.
Set it in the "ExtraHtml Text" in ND Studio.

Olivier Bigard
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