Hide field in client side

Hi,
Here is fnunction to hide field in client Side, Javascript:

function HideField(fieldName, visible) {
var label = document.getElementById(fieldName + '_c');
var value = document.getElementById(fieldName + '_d');
if (label)
label.style.display = visible ? 'inline' : 'none';
if (value)
value.style.display = visible ? 'inline' : 'none';
}


thanks,
Rami Heleg