add validaters for date time and room select.

change color to emphasis [beta] state

change color of unchanged textfield

shadowing date & time text to improve readability

improve some English score :-PPPP

adopt more elaborate technique to \beta :-P

makes changes both features and styles ...

makes many changes in
1. remove logon logoff checkbox. they aren't needed anymore because of algorithm changes.
2. add excel output button
3. change database format due to server format change
4. adds footer
5. make few design ajustments, including text field shadow , etc...

add placeholder and width of time field

first release