Try this javascript function - works on IE4+, untested on NS:
function selectAll(objSelect)
{
	if (objSelect && objSelect.multiple)
	{
		var colOptions = objSelect.options;
		for (var i=0; i<colOptions.length; i++)
			colOptions[i].selected = true;
	}
}

call it form button like this:
<input type="button" onclick="javascript:selectAll
(document.formname.selectname)">

HTH
Phil

> I have a multiple select list populated by an ASP query. I want to put a 
> button next to it to enable the user to select all items from the list. 
> What sort of code do I attach to the button?