function lftmnu_showSubMenu(divName){
	for(var i=0;i<4;i++){
		document.getElementById("submenu_"+(i+1)).style.display="none";
	}
	var block = document.getElementById(divName);
	if(block.style.display=="none"){
		block.style.display="block";
	}else{
		block.style.display="none";
	}
}