function mouse_over(section) {
	markl = section + '_markl';
	document.getElementById(markl).innerHTML = "►";
	markr = section + '_markr';
	//alert('l: '+markl+'\nr: '+markr);
	document.getElementById(markr).innerHTML = "◄";
}

function mouse_out(section) {
	markl = section + '_markl';
	document.getElementById(markl).innerHTML = " ";
	markr = section + '_markr';
	//alert('l: '+markl+'\nr: '+markr);
	document.getElementById(markr).innerHTML = " ";
}