function ShowHideElement(elementID) {
	var prop
	if (document.getElementById)
		prop = document.getElementById(elementID).style
	else if (document.all)
		prop = document.all[elementID].style
	else if (document.layers)
		prop = document.layers[elementID]

	if (prop.display=='none')
		//alert('object hidden');
		prop.display = 'none'
	else
		//alert('object visible');
		prop.display = ''

	//alert('hiding' + prop.display);
}


function showControls()
{
	var workTypeSelection;


	workTypeSelection = document.forms[0].work_type_selector.value


	//alert('control: ' + workTypeSelection );


	switch ( workTypeSelection ) {
						case '18':
					document.getElementById('task_selector').disabled = true;
					document.getElementById('is_billable').disabled = true;
					break;

				case '21':
					document.getElementById('task_selector').disabled = true;
					document.getElementById('is_billable').disabled = true;
					break;

				case '25':
					document.getElementById('task_selector').disabled = true;
					document.getElementById('is_billable').disabled = true;
					break;

				case '34':
					document.getElementById('task_selector').disabled = true;
					document.getElementById('is_billable').disabled = true;
					break;

				case '35':
					document.getElementById('task_selector').disabled = true;
					document.getElementById('is_billable').disabled = true;
					break;

				case '41':
					document.getElementById('task_selector').disabled = true;
					document.getElementById('is_billable').disabled = true;
					break;

				case '19':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '23':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '26':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '27':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '28':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '29':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '30':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '31':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '32':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '33':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '36':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '37':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '38':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '39':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '40':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;

				case '42':
					document.getElementById('task_selector').disabled = false;
					document.getElementById('is_billable').disabled = false;
					break;


		default:
			//do nothing
			break;
	}
}