function disable_css(disable) {
	for ( i=0; i<document.styleSheets.length; i++) {
		document.styleSheets.item(i).disabled=disable;
	}
	if (disable) {
		document.getElementById('low_high_graphics').innerHTML = "<a href='#' onclick='disable_css(false)'>High Graphics Version</a>";
	}
	else {
		document.getElementById('low_high_graphics').innerHTML = "<a href='#' onclick='disable_css(true)'>Low Graphics Version</a>";
	}
}