function getElementsByClass(searchClass, domNode, tagName) {
	if (domNode == null) domNode = document;
	if (tagName == null) tagName = '*';
	var el = new Array();
	var tags = domNode.getElementsByTagName(tagName);
	var tcl = " "+searchClass+" ";
	for(i=0,j=0; i<tags.length; i++) {
		var test = " " + tags[i].className + " ";
		if (test.indexOf(tcl) != -1)
			el[j++] = tags[i];
	}
	return el;
}

function closeAllByClass(classe) {
	var allPageTags=getElementsByClass(classe);
	for (i=0; i<allPageTags.length; i++) {
		allPageTags[i].style.display='none';
	}
} 

function changemenu(id) {
	if(document.getElementById(id).style.display=='block') {
		document.getElementById(id).style.display = 'none';
	} else {
		closeAllByClass('submenu_up');
		document.getElementById(id).style.display = 'block';
	}
}