How can I use onclick to change a table cell background color

[Michael]

How can I use onclick to change a table cell background color. I know
I can use this.className= ?

to change the classname. But then I would have to put the code into
every single table cell. I read once about using a collection method.

Lets say a table has 100 TD Cells with a white background. I want to
click on just 1 and then have it change to a Yellow background. Then
when I click on a different Cell have the old one change back to white
and the new Cell change to Yellow. etc.

[Woody]

function BgnDay_onclick( ) {
var IdString = ""
var TempDay = 0
var GoodPick = true

if (DateSet == false) {
IdString = window.event.sr cElement.id;
if (IdString.lengt h < 4) {
IdString = window.event.sr cElement.parent Element.id;
if (IdString.lengt h < 4)
IdString = window.event.sr cElement.parent Element.parentE lement.id; }
if (document.all(I dString).innerT ext !== "") {
TempDay = Math.abs(CellTo DayNumber(IdStr ing));
if (document.all(I dString).style. backgroundColor !== "red") {
if (StartCell.leng th > 0) {
BackColor(Start Cell);
StartDay = TempDay; }
RedItOut(IdStri ng);
StartDay = Math.abs(CellTo DayNumber(IdStr ing));
StartCell = IdString;}
else
{ BackColor(IdStr ing);
StartCell = "";
StartDay = 0 }}}
DisplayDate();

butchered from some code i wrote for a project

Woody
any sugestion or comment made by me should be examined first for
validity and appropriateness before assuming i have any idea at all
what the heck i am talking about. I am not responsible for anything you
may see with my name attached to it, i think.

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