function hide(it){/*ÏÔÒþ²Ëµ¥*/
	it.children[1].style.visibility="hidden";
	it.children[1].style.display="none";
	it.className="mainMenuLi iconArw";
}
function show(it){	
	it.children[1].style.visibility="visible";
	it.children[1].style.display="block";
	it.className="mainMenuLi2";
}