Breite u Höhe einzelner Zeilen/spalten ändern

<script type="text/javascript">
var newWidthOfNav = 10;



//Ab hier nichts mehr ändern
var i;
var done = false;
var temp;
var childs;
var allTds = document.getElementsByTagName('td');

for(i = 0; (i < allTds.length) && (!done); i++)
{
if(allTds[i].className == 'edit_nav_bg')
{
temp = allTds[i].parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode;
childs = temp.childNodes;

for(i = 0; (i < childs.length) && (!done); i++)
{
if(childs[i].nodeName == 'TR')
{
childs = childs[i].childNodes;

for(i = 0; (i < childs.length) && (!done); i++)
{
switch(childs[i].width)
{
case '247':
childs[i].style.width = newWidthOfNav + 'px';
break;

case '224':
childs[i].style.width = '100%';
done = true;
break;

default:
break;
}
}
}
}
}
}
</script>