function toggleLayer(whichLayer) {
	if (document.getElementById) {
		// this is the way the standards work
		var style2 = document.getElementById(whichLayer).style;
		style2.display = style2.display? "":"block";
	} else if (document.all) {
		// this is the way old msie versions work
		var style2 = document.all[whichLayer].style;
		style2.display = style2.display? "":"block";
	} else if (document.layers) {
		// this is the way nn4 works
		var style2 = document.layers[whichLayer].style;
		style2.display = style2.display? "":"block";
	}
}

function hideLayer(whichLayer) {
	if(document.getElementById) {
		var style2 = document.getElementById(whichLayer).style;
		style2.display = style2.display? "":"";
		var style2_button = document.getElementById(whichLayer+"_button").style;
		style2_button.borderBottomColor = "#1558A0";
		style2_button.backgroundColor = "#65A4DD";
		
	} else if (document.all) {
		var style2 = document.all[whichLayer].style;
		style2.display = style2.display? "":"";
		var style2_button = document.all[whichLayer+"_button"].style;
		style2_button.borderBottomColor = "#1558A0";
		style2_button.backgroundColor = "#65A4DD";
	} else if (document.layers) {
		// this is the way nn4 works
		var style2 = document.layers[whichLayer].style;
		style2.display = style2.display? "":"";
		var style2_button = document.layers[whichLayer+"_button"].style;
		style2_button.borderBottomColor = "#1558A0";
		style2_button.backgroundColor = "#65A4DD";
	}
}

function showLayer(whichLayer) {
	if(document.getElementById) {
		var style2 = document.getElementById(whichLayer).style;
		style2.display = style2.display? "block":"block";
		var style2_button = document.getElementById(whichLayer+"_button").style;
		style2_button.borderBottomColor = "#65A4DD";
		style2_button.backgroundColor = "#1558A0";
	} else if (document.all) {
		var style2 = document.all[whichLayer].style;
		style2.display = style2.display? "block":"block";
		var style2_button = document.all[whichLayer+"_button"].style;
		style2_button.borderBottomColor = "#65A4DD";
		style2_button.backgroundColor = "#1558A0";
	} else if (document.layers) {
		// this is the way nn4 works
		var style2 = document.layers[whichLayer].style;
		style2.display = style2.display? "block":"block";
		var style2_button = document.layers[whichLayer+"_button"].style;
		style2_button.borderBottomColor = "#65A4DD";
		style2_button.backgroundColor = "#1558A0";
	}
}