function changeMenu(image) {
	if (!checkMenu(image.id)) {
		if (image.src.indexOf("_off.gif") > 0) {
			image.src = image.src.replace("_off.gif", "_on.gif");
		}else{
			image.src = image.src.replace("_on.gif", "_off.gif");
		}		
	}
}
function checkMenu(str_image) {
	var page=document.location.href;
	var posSlash = page.lastIndexOf("/");
	var posDot = page.lastIndexOf(".html");	
	var idPage = page.substring(posSlash+1, posDot);
	if (idPage==str_image) {
		return true;		
	}else{
		return false;
	}
}