function display(x){
var elm;
elm = document.getElementById(x);
var display = elm.style.display;
if(display == 'none')
	elm.style.display = "inline";
else
	elm.style.display = "none";
}// end display

function expand_all(x)
{
	for(var i = 1; i < x + 1; i++)
		var elm = document.getElementById('cat_' + i).style.display = "inline";
}// end expand_all

function shrink_all(x)
{
	for(var i = 1; i < x + 1; i++)
		var elm = document.getElementById('cat_' + i).style.display = "none";
}// end shrink_all