/*<!-- 
	Listado de funciones de validaciones:
	- check_email
	- check_date
	- check_age
-->*/


/*<!-- check_email
------------------------------------------------------------------>*/
function check_email(idCampo)
{
	var email = document.getElementById(idCampo).value;
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return filter.test(email);
}


/*<!-- check_date

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.

REMARKS:
   Avoids some of the limitations of the Date.parse()
   method such as the date separator character.

------------------------------------------------------------------>*/

function check_date(idCampo,format) {

	var strValue = document.getElementById(idCampo).value;
	var objRegExp = /^\d{1,2}(\-|\/|\.)\d{1,2}\1\d{4}$/
 
	if (format.toString()=='DMY') {
		var indexDay = 0;
		var indexMonth = 1;
		var indexYear = 2;
	}
	else if (format=='MDY') {
		var indexDay = 1;
		var indexMonth = 0;
		var indexYear = 2;
	}
	
	//check to see if in correct format
	if(!objRegExp.test(strValue)) {
		return false; //doesn't match pattern, bad date
	}
	else {
		var strSeparator = strValue.substring(2,3) //find date separator
		var arrayDate = strValue.split(strSeparator); //split date into month, day, year

		//create a lookup for months not equal to Feb.
		var arrayLookup = { '01' : 31,'03' : 31, '04' : 30,'05' : 31,'06' : 30,'07' : 31,'08' : 31,'09' : 30,'10' : 31,'11' : 30,'12' : 31}
		var intDay = parseInt(arrayDate[indexDay],10); 

		//check if month value and day value agree
		if(arrayLookup[arrayDate[indexMonth]] != null) {
			if(intDay <= arrayLookup[arrayDate[indexMonth]] && intDay != 0)
			return true; //found in lookup table, good date
		}
    
		//check for February (bugfix 20050322)
		//bugfix  for parseInt kevin
		//bugfix  biss year  O.Jp Voutat
		var intMonth = parseInt(arrayDate[indexMonth],10);
		if (intMonth == 2) { 
			var intYear = parseInt(arrayDate[indexYear]);
			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
}


/*<!-- check_age
------------------------------------------------------------------>*/
function check_age(idCampo)
{
	var age = document.getElementById(idCampo).value;
	var filter = /^([0-9]{1,3})$/;
	return filter.test(age);
}