/*
	txt - text you want to check
	len - length of the text you want to validate
	name - name of the textfield
	required - true: This field is required; false: This field is not required
	return:
	Failed - "Please enter a proper " + name + "
	Success - ""	

*/
function checkText(txt, name, len, required){		
	return (required)?((txt.length != len)?"Please enter a proper " + name + ".\n":""):((txt)?((txt.length != len)?"Please enter a proper " + name + ".\n":""):(""))	
}
/*
	field - field name you want to check	
	name - name of the textfield
	return:
	Failed - "Please enter a proper " + name + "
	Success - ""	
*/
function isEmpty(field, name){
	return (!field)?"Please enter a proper " + name + ".\n":"";
}
/*
	email - email you want to validate
	required - true: This field is required; false: This field is not required

	return:
	Failed - "Please enter a proper " + name + "
	Success - ""	
*/

function isEmail(email, required){
	return (required)?((email.indexOf('.')==-1 || email.indexOf('@')==-1)?"Please enter a proper email.\n":""):((email)?((email.indexOf('.')==-1 || email.indexOf('@')==-1)?"Please enter a proper email.\n":""):(""))
}



/*
	txt - phone number you want to check
	len - length of the text you want to validate
	name - name of the textfield, either fax, pager...
	required - true: This field is required; false: This field is not required
	return:
	Failed - "Please enter a proper " + name + "
	Success - ""
*/

function isPhone(txt, len, name, required){
	var x = -1;	
	if(required){
		if(txt.length != len)
			return "Please enter a proper " + name + ".\n";
		else
			while(x++ < len)
				if(isNaN(txt.charAt(x)))
					return "Please enter a proper " + name + ".\n";
	 }else{
			if(txt)
				if(txt.length != len)
					return "Please enter a proper " + name + ".\n";
				else
					while(x++ < len)
						if(isNaN(txt.charAt(x)))
							return "Please enter a proper " + name + ".\n";		
	 }

	return "";	
}

/*
	check the string is valid number or not
*/
function validNumber(txt)
{
	x = -1;
	while (x++ < txt.length)
		if(isNaN(txt.charAt(x)))
			return false;
	return true;
}

/*
	src - source you want to compare
	target - target to compare to

	return:
	Failed - "Please enter a proper " + name + "
	Success - ""
*/

function notMatch(src, target){
	return (src == target)?true:false;
}



/*

	run all validation, check whatever you want to check
	Example: validate('isEmail(emailField)', 'isEmpty(fieldName, \'Name\')', ..........)

	return:
	Failed - true
	Success - false	

*/

function validate(){
	err = "";

	for(var x=0; x<(validate.arguments.length); x++)
		err = err + eval(validate.arguments[x]);

	if (err.length)alert(err);
		return !err.length;
}



/*
	Get today date in mm/dd/yyyy format
*/

function getTodayDate(){
	var today = new Date();
	var todayDate = (today.getMonth()+1) + "/" + today.getDate() + "/" + today.getFullYear();
	return todayDate;
}


/*
	Check whather is number.	
*/

function isValidNumber(target, name, required){
	return (required)?((!target)?"Please enter a proper " + name + "\n":((isNaN(target))?"Please enter a proper " + name + "\n":"")):((target!="")?((isNaN(target))?"Please enter a proper " + name + "\n":""):"");
}

/*
	Check whather is real credit card.
*/

function isCreditCard(target, required){
	return (required)?((target.length!=16 && target.length!=14 || !validNumber(target))?"Please enter a proper credit card number.\n":""):((target)?((target.length != 16 || target.length != 14)?"Please enter a proper credit card number.\n":""):"");
}

/*
	check valid date
*/

function checkExpireDate(yy, mm, dd, err)
{
	if ((new Date(yy, mm, dd)) < (new Date()))
		return err+"\n";
	return "";

}