var t;

function chgl()
{
  var a, i, v;
  a=chgl.arguments;
  for(i=0; i<(a.length-1); i+=2)
  {
    l=a[i];
    v=a[i+1];
    if(document.layers) // NS
    {
      eval("document.layers['"+l+"'].visibility='"+v+"'");
    }
    else
    {
      if(v=='show') v='visible';
      if(v=='hide') v='hidden';
      if(document.all) // IE
      {
        eval("document.all['"+l+"'].style.visibility='"+v+"'");
      }
      else if(document.getElementById) // NS6, FireFox
      {
        document.getElementById(l).style.visibility=v;
      }
    }
  }
}