function showMenuItem(item_name) {

	
	if (eval(item_name+".style.display")=="none") {
		eval (item_name+".style.display='block'");
		eval (item_name+"_butt_l"+".style.background='99cbef'");
		eval (item_name+"_butt_r"+".style.background='99cbef'");
		return;
	}

	else {
		eval (item_name+".style.display='none'");
		eval (item_name+"_butt_l"+".style.background='44a0e2'");
		eval (item_name+"_butt_r"+".style.background='url(../img/left_mnu_btn_part_right.gif)'");
		return;
	}		
}