// JavaScript Document
function showBasicRelief() {
	hidediv("detailed_relief");
	hidediv("advanced_relief");
	showdiv("basic_relief");
}

function showDetailedRelief() {
	showdiv("detailed_relief");
	hidediv("basic_relief");
	hidediv("advanced_relief");
}

function showAdvancedRelief() {
	hidediv("detailed_relief");
	hidediv("basic_relief");
	showdiv("advanced_relief");
}

function showAdvancedPleochroism() {
	hidediv("basic_pleochroism");
	showdiv("advanced_pleochroism");
}

function showBasicPleochroism() {
	showdiv("basic_pleochroism");
	hidediv("advanced_pleochroism");
}


function hidediv(id) {
	//safe function to hide an element with a specified id
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'none';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'none';
		}
		else { // IE 4
			document.all.id.style.display = 'none';
		}
	}
}

function showdiv(id) {
	//safe function to show an element with a specified id
		  
	if (document.getElementById) { // DOM3 = IE5, NS6
		document.getElementById(id).style.display = 'block';
	}
	else {
		if (document.layers) { // Netscape 4
			document.id.display = 'block';
		}
		else { // IE 4
			document.all.id.style.display = 'block';
		}
	}
}