var flag = new Array(0,0,0,0,0,0,0,0);
function menu_script(num)
{
	var d = document.getElementsByTagName("div");
	if((num<=7) && (num>=0))
	{
		if(flag[num] == 0)
		{
			for(var i=0; i<=7; i++)
			{
				d[i].style.visibility = "hidden";
				flag[i] = 0;
			}
			d[num].style.visibility = "visible";
			flag[num] = 1;
		}
		else
		{
			for(var i=0; i<=7; i++)
			{
				d[i].style.visibility = "hidden";
				flag[i] = 0;
			}
			d[num].style.visibility = "hidden";
			flag[num] = 0;
		}
	}
	else
	{
		for(var i=0; i<=7; i++)
		{
			d[i].style.visibility = "hidden";
			flag[i] = 0;
		}
	}
}
<!--
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}