function init() {
	IE = (document.all)
	NC = (document.layers)
	Opera = (document.getElementById)
}

function show_submenu(num) {
init();
for(k=1; k<=5; k++)
 {
   if(IE)
	{
	eval('document.all["submenu_'+k+'"].style.visibility="hidden"')
	eval('document.all["submenu_'+num+'"].style.visibility="visible"')
	}
	if(NC)
	{
	eval('document.layers["submenu_'+k+'"].visibility="hidden"')
        eval('document.layers["submenu_'+num+'"].visibility="visible"')	
	}
	if(Opera)
	{
	eval('document.getElementById("submenu_'+k+'").style.visibility = "hidden"')
	eval('document.getElementById("submenu_'+num+'").style.visibility = "visible"')
	}
  }
}


function hide_submenu() {
init();
for(k=1; k<=5; k++)
 {
   if(IE)
	eval('document.all["submenu_'+k+'"].style.visibility="hidden"')
	if(NC)
	eval('document.layers["submenu_'+k+'"].visibility="hidden"')
	if(Opera)
	eval('document.getElementById("submenu_'+k+'").style.visibility = "hidden"')
  }
}