function actionLogin() {
	
	// check required fields
	if( document.PriceCalc.Username.value.length == 0 && document.PriceCalc.Password.value.length == 0 ){
		alert( "Please enter your username and password before logging in." );
		document.PriceCalc.Username.focus();
	}else if( document.PriceCalc.Username.value.length == 0 ){
		alert( "Please enter your username before logging in." );
		document.PriceCalc.Username.focus();
	}else if( document.PriceCalc.Password.value.length == 0 ){
		alert( "Please enter your password before logging in." );
		document.PriceCalc.Password.focus();
	}else{
		document.PriceCalc.mode.value = "login";
		document.PriceCalc.submit();
	}
}