// JavaScript Document
function showLayer(lyr) {
   document.getElementById(lyr)
      .style.display = 'inline';
}


function hideLayer(lyr) {
   document.getElementById(lyr).
      style.display = 'none';
}

function hideClass(lyr) {
   document.getElementById(lyr).
      className = 'hidden';
}

function showSubcat()
  {
  var x=document.getElementById("category_id").selectedIndex;
  	if(document.getElementsByTagName("option")[x].value == '2')
  	{
  		showLayer(document.getElementsByTagName("option")[x].value);
  	}
  }

function hideSubcat()
  {
  var x=document.getElementById("category_id");
  for (i=0;i<x.length;i++)
    {
    	hideLayer(x.options[i].value)
    }
  }

function hideSubcat2()
  {
  var x=document.getElementById("category_id").selectedIndex;
  	if(document.getElementsByTagName("option")[x].value !== '2')
  	{
  		hideLayer(document.getElementsByTagName("option")[1].value);
  	}
  }