function select_item(element) {
	if (element.selectedIndex==0) { return; }
	window.location = 'factsheet.php?m='+element.options[element.selectedIndex].value;
}

function confirm_del(id) {
	if (confirm('Are you sure you want to delete this factsheet?')) {
		window.location='?del='+id;
	}
}

function validate_form() {
	if (document.getElementById('material_name').value=='') {
		alert('Please enter a material name before saving');
		return false;
	}
	
	return true;
}

function show_hide_ul(id) {
	element = document.getElementById('ul'+id);
	if (element.style.display=='block') { element.style.display='none'; }
	else { element.style.display='block'; };
	
}