extern function convert(varName,des,en,somme) {

	var multiplier = 0.0;
	var returnString = "Erreur !";
	var result;

	if (des == "FRA") {
		var FRA_EUR = 6.55;

		if (en == "FRA")
			multiplier = 1.0;
		else if (en == "EUR")
			multiplier = FRA_EUR;
			} else if (des == "EUR") {
		/*
		 * EURO
		 */
		var EUR_FRA = 0.1526;

		if (en == "EUR")
			multiplier = 1.0;
		else if (en == "FRA")
			multiplier = EUR_FRA;
	} 

	if (multiplier != 0.0) {
		 result = somme / multiplier;
		 returnString = String.toString(result);
		 returnString = String.format("%.2f", returnString);
	}
 	
	/*
	 * Return the results to the browser
	 */
	WMLBrowser.setVar(varName,returnString);
	WMLBrowser.refresh();
}