time validation and converting military time

let me start by saying i don't know javascript. i'm stealing it all. but i'm a good person!



i found a script that does almost exactly what i need. then i found another script that does the only thing the first one doesn't do. i've failed miserably at combining the two, so i've come to you for help. what i need is a script to validate time in a text box. it should accept am/pm or military time, but if it's fed military time, it needs to convert it to am/pm. it needs to do so with an onBlur. i've got the validation working with the onBlur, but i don't have it converting military time. here's the script i'm using now:

<!-- Begin function IsValidTime(timeStr) { // Checks if time is in HH:MM:SS AM/PM format. // The seconds and AM/PM are optional. var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/; var matchArray = timeStr.match(timePat); if (matchArray == null) { alert("Time is not in a valid format."); return false; } hour = matchArray[1]; minute = matchArray[2]; second = matchArray[4]; ampm = matchArray[6]; if (second=="") { second = null; } if (ampm=="") { ampm = null } if (hour < 0 || hour > 23) { alert("Hour must be between 1 and 12. (or 0 and 23 for military time)"); return false; } if (hour <= 12 && ampm == null) { if (confirm("Please indicate which time format you are using. OK = Standard Time, CANCEL = Military Time")) { alert("You must specify AM or PM."); return false; } } if (hour > 12 && ampm != null) { alert("You can't specify AM or PM for military time."); return false; } if (minute<0 || minute > 59) { alert ("Minute must be between 0 and 59."); return false; } if (second != null && (second < 0 || second > 59)) { alert ("Second must be between 0 and 59."); return false; } return false; } // End -->

i really don't even need the seconds in the time, but i figured i'd leave them there rather than risking breaking it. is there an easy way to make this change military time to am/pm? thanks in advance.