var i=-135
var c=0
var intHide
var speed=3

function show_hide_menu()
{
if (c==0)
	{
	c=1
	clearInterval(intHide)
	intShow=setInterval("show()",10)
	}
else
	{
	c=0
	clearInterval(intShow)
	intHide=setInterval("hide()",10)
	}
}

function show()
{
if (i<-12)
	{
	i=i+speed
	myMenu.style.left=i
	}
}

function hide()
{
if (i>-135)
	{
	i=i-speed
	myMenu.style.left=i
	}
}