function show_hide(element,value){
	valeur=value.value;
	if(valeur==3){
		Element.removeClassName($(element),"hide");
        Element.addClassName($(element),"show");
	}
	else{
		Element.removeClassName($(element),"show");
        Element.addClassName($(element),"hide");
	}

        /*if(Element.classNames($(element))=="hide"){
                Element.removeClassName($(element),"hide");
                Element.addClassName($(element),"show");
        }
        else{
                Element.removeClassName($(element),"show");
                Element.addClassName($(element),"hide");
        }*/
}