function show(i,pos)
{	

	document.getElementById('div_'+i+'_on').style.visibility="visible";
	document.getElementById('div_'+i+'_off').style.visibility="hidden";
}
function hide(i,pos)
{
		document.getElementById('div_'+i+'_on').style.visibility="hidden";
	document.getElementById('div_'+i+'_off').style.visibility="visible";

}