function showTab(m,n)
{
var i;
for(i=1;i<n+1;i++)
{
 if(document.getElementById("menu_"+n+"_"+i).className=='on')
	{
		document.getElementById("menu_"+n+"_"+i).className="";
		document.getElementById("content_"+n+"_"+i).style.display="none";
	}

}
document.getElementById("content_"+n+"_"+m).style.display="";
document.getElementById("menu_"+n+"_"+m).className="on";

}