function treatKeys(key) { // réagit aux touches -evenement
	

	if(window.Event){
		/* case netscape */
		if(key.which=="13"){
			obj = document.getElementById(buttonName);
			obj.click();
		}
	}
	else{
		/*case ie */
		
		if(event.keyCode=="13"){
			
			obj = document.getElementById(buttonName);
			obj.click();
		}
	}
	
	
}