Javascript date validation function

function validateDate(strValue) {
/************************************************
DESCRIPTION: Validates that a string contains only
valid dates with 2 digit month, 2 digit day,
4 digit year. Date separator can be ., -, or /.
Uses combination of regular expressions and
string parsing to validate date.
Ex. mm/dd/yyyy or mm-dd-yyyy or mm.dd.yyyy

PARAMETERS:
strValue - String to be tested for validity

RETURNS:
True if valid, otherwise false.

*************************************************/
var objRegExp = /^\d{1,2}(\-|\/|\.)\d{1,2}\1\d{4}$/

//check to see if in correct format
if (!objRegExp.test(strValue))
return false; //doesn't match pattern, bad date
else {
var strSeparator = strValue.substring(strValue.length - 5, strValue.length - 4);
var arrayDate = strValue.split(strSeparator);
var arrayLookup = new Array (0,31,0,31,30,31,30,31,31,30,31,30,31);
var intDay = parseInt(arrayDate[1], 10);
var intMonth = parseInt(arrayDate[0], 10);
//check if month value and day value agree
if (arrayLookup[intMonth] != null) {
if (intDay <= arrayLookup[intMonth] && intDay != 0)
return true; //found in lookup table, good date
}
if (intMonth == 2) {
var intYear = parseInt(arrayDate[2]);
if (intDay > 0 && intDay < 29) {
return true;
}
else if (intDay == 29) {
if ((intYear % 4 == 0) && (intYear % 100 != 0) ||
(intYear % 400 == 0)) {
// year div by 4 and ((not div by 100) or div by 400) ->ok
return true;
}
}
}
}
return false; //any other values, bad date
}