function fremhaevja(object) {
	if (document.getElementById && document.getElementById(object) != null) {
	document.getElementById(object).style.color='red';
        }
}

function fremhaevnej(object) {
	if (document.getElementById && document.getElementById(object) != null) {
	document.getElementById(object).style.color='black';
	}
}


function show(object) {
if (document.getElementById && document.getElementById(object) != null) {
document.getElementById(object).style.visibility='visible';
document.getElementById(object).style.display='block';
}
<!--
else if (document.layers && document.layers[object] != null)
document.layers[object].visibility = 'visible';
else if (document.all) {
document.all[object].style.zIndex = 100;
document.all[object].style.visibility = 'visible';
}
-->
}
function hide(object) {
if (document.getElementById && document.getElementById(object) != null) {
document.getElementById(object).style.visibility='hidden';
document.getElementById(object).style.display='none';
}
<!--

else if (document.layers && document.layers[object] != null)
document.layers[object].visibility = 'hidden';
else if (document.all)
document.all[object].style.visibility = 'hidden';
-->

}