// Switch on the weather legend
function showLegend (pictureUrl) {
	if (is_ie || is_nav6up) {
		change_image('key','legend_on');
	}
	else {
		open_win (pictureUrl, 'Key', '480', '530', 'no');
	}
}

// Switch off the weather legend
function hideLegend () {
	if (is_nav6up || is_ie) {
		change_image('key','legend_off');
	}
}