data type not recognised in firefox (?)

at least, i think that is the problem! The following code works fine in IE but not in Firefox - having messed around with some alerts to try and locate the problem I sometimes get it to return "addRemove" as NaN in Firefox. Any help much appreciated!

JAVASCRIPT

currentNumber = 0;

function displayTables(tableString){
var table = tableString.options[tableString.selectedIndex].value;
var tableNumber = parseInt(table);
var addRemove = tableNumber - currentNumber;

if (addRemove <= 0){
removeTables(addRemove,tableNumber);
}
else{
addTables(currentNumber,tableNumber);
}

currentNumber = tableNumber;
}

function removeTables(addRemove,tableNumber){
var deleteThisMany = 0 - addRemove;
var startFrom = tableNumber + 1;
var tablesToDelete = tableNumber + deleteThisMany;

for (x = startFrom;x <= tablesToDelete;x++){
var tableId = document.getElementById("table" + x);
tableId.removeNode(true);
}
}

function addTables(currentNumber,tableNumber){
var startFrom = currentNumber + 1;

for (x = startFrom;x <= tableNumber;x++){
var newNode = document.createElement("DIV");
testDiv.appendChild(newNode);
newNode.id="table" + x;
newNode.innerHTML = "htmlString" + x;
}
}

HTML

<select name="tables" size="1" onchange="displayTables(this)">
<option value="0" selected="selected">Please Select</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>

 

Hi!

Please use the

 and [html] tags to preserve code formatting in future.

I suggest you download and install [url=http://www.joehewitt.com/software/firebug/]Firebug[/url] for all Javascript development in Firefox. It includes a step-by-step debugger that you can use to pin-point tricky problems such as this.

Regards
- P

Code (markup):

 

Thanks - Firebug looks like a great tool. To answer my own question (incase it helps anyone) removeNode() works in IE only, so I had to change

tableId.removeNode(true);

Code (markup):

to

tableId.parentNode.removeChild(tableId);

Code (markup):

Cheers!