// Detect if the browser is IE or not.
// If it is not IE, we assume that the browser is NS.
var IE = document.all?true:false

// If NS -- that is, !IE -- then set up for mouse capture
if (!IE) document.captureEvents(Event.MOUSEMOVE)

// Main function to retrieve mouse x-y pos.s

function checkToCloseSubNav(e) {
  if (IE) { // grab the x-y pos.s if browser is IE
    tempX = event.clientX + document.body.scrollLeft
    tempY = event.clientY + document.body.scrollTop
  } else {  // grab the x-y pos.s if browser is NS
    tempX = e.pageX
    tempY = e.pageY
  }  
  // catch possible negative values in NS4
  if (tempX < 0){tempX = 0}
  if (tempY < 0){tempY = 0}  
  // show the position values in the form named Show
  // in the text fields named MouseX and MouseY
  if(tempY>200){
  	closeSubNav();
  }
  
  return true
}

defaultSubNav = "username";
currentSubNav = defaultSubNav;

function openSubNav(thisSubNav){
	document.getElementById(currentSubNav).style.display='none';
	document.getElementById(thisSubNav).style.display='block';
	currentSubNav=thisSubNav;
	document.onmousemove = checkToCloseSubNav;
}

function closeSubNav(){
	document.getElementById(currentSubNav).style.display='none';
	document.onmousemove = null;
	document.getElementById(defaultSubNav).style.display='block';
	currentSubNav=defaultSubNav;
}