function add()
{
	document.form1.field0.value = parseFloat(document.form1.qty0.value) * 100
	document.form1.field1.value = parseFloat(document.form1.qty1.value) * 250
	document.form1.total.value = parseFloat(document.form1.field0.value) + parseFloat(document.form1.field1.value) + parseFloat(document.form1.field2.value)
}

function print_page(where)
{
	var is_mac=(navigator.platform.indexOf("Mac") != -1);
	(document.all && is_mac)?
	alert("Select \"Print\" from the menu") : where? where.window.print() :
	window.print();
}