Just started to learn HTML/Java. Need to add two text fields for data entry. After user enters the data, need do validation to check if the data entered is a number or not. If it is a number, check if it is in the specified range or not. If it is not a number or the number out of range, pop up a error message.
When testing the code, found that I could not close the alert message. Please help.
http://i19.tinypic.com/6jl84g2.jpg