function setTab(m,n){
	var tli=document.getElementById("menu"+m).getElementsByTagName("li");
	var mli=document.getElementById("main"+m).getElementsByTagName("ul");
	for(i=0;i<mli.length;i++){
		tli[i].className=i==n?"hover":"";
		mli[i].style.display=i==n?"block":"none";
	}
}