function li_highlight() {
	tbl.style.backgroundColor=color;
}


function shownav(LayerName) 
	{
		var VState = document.getElementById(LayerName).style.display;

		if (VState=="inline") 
			{
			document.getElementById(LayerName).style.display = "none";
				var z = LayerName+"icon";
				document.getElementById(z).style.backgroundImage = "url(images/bullet_plus.gif)";
			}

		if (VState=="none") 
			{
			document.getElementById(LayerName).style.display = "inline";
				var z = LayerName+"icon";
				document.getElementById(z).style.backgroundImage = "url(images/bullet_minus.gif)";
			} 
			
var navsub = new Array();
	navsub[0] = 'subnav1';
	navsub[1] = 'subnav2';
	navsub[2] = 'subnav3';
	navsub[3] = 'subnav4';

		var x =0;
		while (x < navsub.length)
			{
			if (navsub[x] != LayerName)
				{
				//alert(x +"  - -  "+navsub[x]);
				var y = navsub[x];
				document.getElementById(y).style.display = "none";
				z = y+"icon";
				document.getElementById(z).style.backgroundImage = "url(images/bullet_plus.gif)";
				}
			x++;
			}

	}