[Greasemonkey] inserting a script on a HTML page

[Fabien Bergeret]

I'm currently working on a script that can translate dollars to euro.
Here is a sample of my code : 
GM_log("Entering analyseDocument "+coteDollar);
 //Creates the conversion script
 var script = document.createElement("script"); 
 GM_log("Script created");
 var contenuScript = 'function convertDollarsToEuros(amount){\nalert("$"+amount+"="+(Math.round(100*amount/'+coteDollar+'))/100+"EUR");\n}';  
 GM_log("Script fed "+contenuScript);
 //Doesn't work on eBay
 script.innerHTML = contenuScript;
 GM_log("Script inserted");

this code works fine on amazon.com, for instance, but, on ebay.com, the last message I have in the console is "Script fed". The line script.innetHTML = contenuScript doesn't seem to work.
Any idea why ?

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