function mySelectAll()
	{
	var ll = document.targetmarkets.elements.length;
	var formIndex = -1;
	for (i=0; i<ll; i++)
		{
		if (document.targetmarkets.elements[i].name == "countries[]")
			{
			formIndex = i;
			}
		}
	if (formIndex == -1)
		{
		alert("My apologies, due to an unexpected error you won't be able to select all items this way.");
		return false;
		}
	ll = document.targetmarkets.elements[formIndex].length; // the number of items in the selection list
	if (document.targetmarkets.allcountries.checked) // has the checkbox been checked?
		{
			for (i=0; i<ll;i++)
				{
				document.targetmarkets.elements[formIndex].options[i].selected = true;
				}
			document.targetmarkets.allcountries.checked = true;
		}
	else
		{
			for (i=0; i<ll;i++) // then deselect the items in the selection list ...
				{
				document.targetmarkets.elements[formIndex].options[i].selected = false;
				}
			document.targetmarkets.allcountries.checked = false; // ... and uncheck the checkbox
		}
	}