function showMenu(num) {
var arr = new Array('ma','mb','mc','md','me','mf','mg','mh');
var no = eval(num)+1;
	for (i=0;i<arr.length;i++) {
	 	eval("document.getElementById('"+arr[i]+"Div"+"').style.display='none'");
	 	eval("document.getElementById('"+arr[i]+"Bg"+"').src='../images/tab0"+(i+1)+"_off.gif';")
	}
	eval("document.getElementById('"+arr[num]+"Div"+"').style.display='block'");
	eval("document.getElementById('"+arr[num]+"Bg"+"').src='../images/tab0"+no+"_on.gif';")
}