var current_layer = 1;

// Count the layers that are on the current page
function count_layers ()
{

	var layerCount = 0;
	var moreLayers = true;

	while ( moreLayers == true )
	{
		if (document.getElementById)
		{
			var layer = document.getElementById('work'+(layerCount+1));
		}
		else if (document.all)
		{
			var layer = document.all['work'+(layerCount+1)];
		}
		else if (document.layers)
		{
			var layer = document.layers['work'+(layerCount+1)];
		}
	
		layer != null ? layerCount++ : moreLayers = false;	
	}
	
	return layerCount;
}

function toggleLayer( layerToHide )
{
	var layerCount = count_layers ();

	// Check to see if a layer has been passed into the function
	if ( layerToHide == null && (current_layer+1) >= 1 && (current_layer+1) <= layerCount )
	{
		var layerToHide = 'work'+(current_layer+1);
		current_layer = current_layer + 1;
	}
	else if ( layerToHide != null )
	{
		current_layer = current_layer - 1;	
	}
	
	// Toggle the Layer
	if (document.getElementById)
	{
		// this is the way the standards work
		var style2 = document.getElementById(layerToHide).style;
		style2.display = style2.display == "block" ? "none":"block";
		
		( current_layer == 1 ) ? document.getElementById('less').style.display = "none" : document.getElementById('less').style.display = "block";
		( current_layer == layerCount ) ? document.getElementById('more').style.display = "none" : document.getElementById('more').style.display = "block";

	}
	else if (document.all)
	{
		// this is the way old msie versions work
		var style2 = document.all[layerToHide].style;
		style2.display = style2.display == "block" ? "none":"block";
		
		( current_layer == 1 ) ? document.all['less'].style.display = "none" : document.all['less'].style.display = "block";
		( current_layer == layerCount ) ? document.all['more'].style.display = "none" : document.all['more'].style.display = "block";
		
	}
	else if (document.layers)
	{
		// this is the way nn4 works
		var style2 = document.layers[layerToHide].style;
		style2.display = style2.display == "block" ? "none":"block";
		
		( current_layer == 1 ) ? document.layers['less'].style.display = "none" : document.layers['less'].style.display = "block";
		( current_layer == layerCount ) ? document.layers['more'].style.display = "none" : document.layers['more'].style.display = "block";

	}

}