minX1 = 289; maxX1 = 300; minY1 = 100; maxY1 =152;
minX2 = 367; maxX2 = 452; minY2 = 100; maxY2 =152;
minX3 = 459; maxX3 = 540; minY3 = 100; maxY3 =152;
minX4 = 547; maxX4 = 632; minY4 = 100; maxY4 =152;

var nMenu=0;
var bEnableHide = false;

function show1(bEnable)
{
	if(bEnable!=0)
	{
  	this.document.all.nav1.style.display="block";
  	nMenu = 1;
  	bEnableHide = false;
  }
  else
  	bEnableHide = true;
}

function show2(bEnable)
{
	if(bEnable !=0)
	{
  	this.document.all.nav2.style.display="block";
  	nMenu = 2;
  	bEnableHide = false;
  }
  else
  	bEnableHide = true;
}

function show3(bEnable)
{
	if(bEnable !=0)
	{
  	this.document.all.nav3.style.display="block";
  	nMenu = 3;
  	bEnableHide = false;
  }
  else
  	bEnableHide = true;
}
function show4(bEnable)
{
	if(bEnable!=0)
	{
  	this.document.all.nav4.style.display="block";
  	nMenu = 4;
  	bEnableHide = false;
  }
  else
  	bEnableHide = true;
}

function Hide()
{
	if(nMenu !=0 && bEnableHide)
	{	
		cx=window.event.x;
		cy=window.event.y;
		if(nMenu==1)
		{
			if(cx<minX1 || cx>maxX1 || cy<minY1 || cy>maxY1)
			{
				document.all.nav1.style.display="none";
				nMenu =0;
				bEnableHide = false;
			}		
		}
		else if(nMenu==2)
		{		
			if(cx<minX2 || cx>maxX2 || cy<minY2 || cy>maxY2)
			{
				document.all.nav2.style.display="none";
				nMenu =0;
				bEnableHide = false;
			}
		}
		else if(nMenu==3)
		{
			if(cx<minX3 || cx>maxX3 || cy<minY3 || cy>maxY3)
			{
				document.all.nav3.style.display="none";
				nMenu =0;
				bEnableHide = false;
			}
		}
         else if(nMenu==4)
		{		
			if(cx<minX4 || cx>maxX4 || cy<minY4 || cy>maxY4)
			{
				document.all.nav4.style.display="none";
				nMenu =0;
				bEnableHide = false;
			}
		}
	}
}

this.document.onmousemove=Hide;