function GetObj(objName){
	if(document.getElementById){
		return eval('document.getElementById("' + objName + '")');
	}else if(document.layers){
		return eval("document.layers['" + objName +"']");
	}else{
		return eval('document.all.' + objName);
	}
}
function Menu(idx, prefix, onstyle, offstyle){
	for(var i=0;i<10;i++){
		if(!GetObj(prefix+"_"+i)) break;
		GetObj(prefix+"_"+i).className = offstyle;
		GetObj(prefix+"_con_"+i).style.display = "none";
	}
		GetObj(prefix+"_"+idx).className = onstyle;
		GetObj(prefix+"_con_"+idx).style.display = "block";
}