javascript for highlight row and toggle onclick color

Question

I need to be able do the following on a TR:

• onmouseover highlight the whole row one colour
• onclick the row highlight the row another colour (if you click the same row again it unhighlights the row - sets it to the original bgcolor)
• a problem I have is that in my listview the row's bgcolor alternates between two colours.
• the code below only works for highlighting one row at a time, the row needs to remain highlighted until it is clicked again.

Here is some code that I use for clicking to select which works but I need to change it so that it toggles the row highlight on/off

<script type="text/javascript"> 
var preEl;
var orgBColor;
var orgTColor;
function highlighttr(el, backColor, textColor) {
    if (typeof (preEl) != 'undefined') {
        preEl.bgColor = orgBColor;
        try { ChangeTextColor(preEl, orgTColor); } catch (e) { ; }
    }
    orgBColor = el.bgColor;
    orgTColor = el.style.color;
    el.bgColor = backColor;

    try { ChangeTextColor(el, textColor); } catch (e) { ; }
    preEl = el;
}


function ChangeTextColor(a_obj, a_color) {
    ;
    for (i = 0; i < a_obj.cells.length; i++)
        a_obj.cells(i).style.color = a_color;
}
</script>

Answer 1

This a traditional way which by the way is cross-browser (and platform).

CSS

.tr {background-color:#fff}
.trOver {background-color:#ddd}
.trClicked {background-color:#bbb}

JS

function over(o)
{
    if ('trClicked' != o.className) o.className = 'trOver';
}
function out(o)
{
    if ('trClicked' != o.className) o.className = 'tr';
}
function clicked(o)
{
    o.className = ('trClicked' == o.className) ? 'tr' : 'trClicked';
}

HTML

<tr class="tr" onmouseover="over(this)" onmouseout="out(this)" onclick="clicked(this)">
    // tds without defined background color...
</tr>