// =================================================================
//validationClass.
//	removeWhiteSpace(field)
//	numeric(field)
//  validateAlphanumeric(field)
// =================================================================


function validationClass(){
	
	this.error = false;
	this.errorMsg=null;
	
	this.removeWhiteSpace = function(field){
		while ('' + field.value.charAt(0) == ' ') 
			field.value = field.value.substring(1, field.value.length);
		while ('' + field.value.charAt(field.value.length - 1) == ' ') 
			field.value = field.value.substring(0, field.value.length - 1);
	}
	
	this.numeric = function(field)
	{
		this.error = false;
		var validNumericCharacters = " /.-0123456789"
		var areNumericCharsValid = "yes";
		var temp;
		for (var e=0; e<field.value.length; e++)
			{
				temp = "" + field.value.substring(e, e+1);
				if (validNumericCharacters.indexOf(temp) == "-1") areNumericCharsValid = "no";
			}
		if (areNumericCharsValid == "no")
		{
					this.errorMsg=("This field must be completed using numbers. Please check your answer and try again.");
					this.error = true;
					return false;
		}
		return true;
	}
	
	//	This makes sure that fields only have alphanumeric values
	this.validateAlphanumeric = function(field)
	{
		this.error = false;
		var validCharacters = "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz1234567890 `~!@#$%^&*()-_=+[{]}\|;:,<.>/?";
		var areCharsValid = "yes";
		var temp;
		for (var i=0; i < field.value.length; i++)
			{
				temp = "" + field.value.substring(i, i+1);
				if (validCharacters.indexOf(temp) == "-1") areCharsValid = "no";
			}
		if (areCharsValid == "no")
		{
				this.errorMsg=("Only characters and numbers are accepted for this field.");
				this.error = true;
				return false;
		}
		return true;
	}
	
	this.isEmpty = function(field)
	{
		this.error = false;
		if ((field == null || field.value.length==0))
		{
			this.errorMsg=("Field is empty.");
			this.error = true;
			return true;
		}
		return false;
	}
	
}
var validation = new validationClass();