Menu dynamique CSS + JS

function menu(idP,id)
{
	if(document.getElementById) {
		element = document.getElementById(id);
		elparent = document.getElementById(idP);
	}else if(document.all) {
		element = document.all[id];
		elparent = document.all[idP];
	}else return;
	
	if(element.style.display == 'block' ) {
		element.style.display = 'none';
		elparent.style.background = 'url("../images/plus.png") no-repeat left';
		
	} else {
		element.style.display = 'block';
		elparent.style.background = 'url("../images/moins.png") no-repeat left';
	}
}