function changeTab( tabname, no, max )
{
    for ( i = 1; i <= max; i++ )
    {
    	if( no == i )
        {
            document.getElementById(tabname+"Tab"+i).style.display = 'block';
            document.getElementById(tabname+"Data"+i).style.display = 'block';
        } else
        {
            document.getElementById(tabname+"Tab"+i).style.display = 'none';
            document.getElementById(tabname+"Data"+i).style.display = 'none';
        }
    }
}