function toggleFilter(filterLayer, filterUrl)
{
	if (document.getElementById)
	{
		// Modern
	    var style2 = document.getElementById(filterLayer).style;
		
		style2.display = style2.display? "":"block";
		document.getElementById(filterLayer).innerHTML = "<center><iframe src='" + filterUrl
		    + "' style='width:750px;height:160px;' frameborder=0 scrolling=no></iframe></center>";
	}
	else if (document.all)
	{
		// Old IE
		var style2 = document.all[filterLayer].style;
		style2.display = style2.display? "":"block";
	}
	else if (document.layers)
	{
		// NN4
		var style2 = document.layers[filterLayer].style;
		style2.display = style2.display? "":"block";
	}
}