var dom = (document.getElementById) ? 1:0

visible = 'visible';
hidden = 'hidden';

if (document.layers) {
  visible = 'show';
  hidden = 'hide';
} else if (document.all) {
  visible = 'visible';
  hidden = 'hidden';
} else if (dom) {
  visible = 'visible';
  hidden = 'hidden';
}

var lastSub = 'intro';

var menuClock = 12;
var menuDoubleCheck = 0;
var hideFlag  = 0;

function menuItem(item){
  menuClock=12;
  if (document.layers) {
    daLastSub = document.layers[lastSub];
    daSub = document.layers[item];
  } else if (document.all) {
    daLastSub = document.all(lastSub).style;
    daSub = document.all(item).style;
  } else if (dom) {
    daLastSub = document.getElementById(lastSub).style;
    daSub = document.getElementById(item).style;
  }

  daSub.visibility = visible;

  if(lastSub!=item) {
  daLastSub.visibility = hidden;
  }
  lastSub = item;
  if (menuDoubleCheck==0) {
  	if (hideFlag==0) {
		hideTimer();
		}
	menuDoubleCheck=1;
	}
}

function hideTimer() {
	if (menuClock < 0)  {
		hideFlag=1;
//		menuHide(lastSub);
		menuItem('intro');
		menuDoubleCheck=0;
		hideFlag=0;
	} else {
  		setTimeout("hideTimer()",1000);
		menuClock = menuClock - 1;
	}
	
}
	
function menuHide(which) {
  if (document.layers) {
    daSub = document.layers[which];
  } else if (document.all) {
    daSub = document.all(which).style;
  } else if (dom) {
    daSub = document.getElementById(which).style;
  }
	
  daSub.visibility = hidden;

}


function doRollOver(which) {

  if (document.layers) {
    daRoll = document.layers[which];
  } else if (document.all) {
    daRoll = document.all(which).style;
  } else if (dom) {
    daRoll = document.getElementById(which).style;
  }

  if(daRoll.visibility==visible) {
  daRoll.visibility = hidden;
  } else {
  daRoll.visibility = visible;
  }
}