Java Script is not working in ubuntu firefox

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http://askubuntu.com – My ASP application is running perfect in windows IE, but when i run on ubuntu firefox Javascript is not working properly.. Below is my java script code..... And I am calling this java script on onFocus and onBlur event. when onBlur is fired from date format 1 digit is removing in ubuntu firefox. please somebody help. function DateFormat(vDateName, vDateValue, e, dateCheck, dateType) { vDateType = dateType; // vDateName = object name // vDateValue = value in the field being checked // e = event // dateCheck // True = Verify that the vDateValue is a valid date // False = F (HowTos)