function a_up(obj, val) {
	var myObj = eval("document.selectForm." + obj);
	if (myObj.value=="") { myObj.value = 0; }
	myObj.value = eval(myObj.value) + val;
	myObj.focus();
}
function a_dn(obj, val) {
	var myObj = eval("document.selectForm." + obj);
	if (myObj.value=="") { myObj.value = 0; }
	myObj.value = eval(myObj.value) - val;
	if (myObj.value < 0) { myObj.value = 0; }
	myObj.focus();
}