// JavaScript Document

function showHide(d)
{
var onediv = document.getElementById(d);
var divs=['frame_1','frame_2','frame_3','frame_4'];
for (var i=0;i<divs.length;i++)
  {
  if (onediv != document.getElementById(divs[i]))
    {
    document.getElementById(divs[i]).style.display='none';
    }
  }
onediv.style.display = 'block';
}