function checkboxSetSelected (field, value)
{

	objField = document.getElementById(field);
	
	for (var i=0; i < objField.length; i++) 
	{
		if (objField[i].value == value) 
		{
			objField[i].selected = true;
		}
	}
}

function checkboxRemoveAllButThis(field, value)
{
	objField = document.getElementById(field);
	removeFields = new Array();
	
	for (var i=0; i < objField.length; i++) 
	{
		if (objField[i].value == value) 
		{
			nText = objField[i].text;
			nValue = objField[i].value;
		}

	}
	
	objField.options.length = 0;
	objField.options[0] = new Option(nText,nValue);
	
}