// Generic Form Validation
// Jacob Hage (jacob@hage.dk)
var checkObjects	= new Array();
var errors		= "";
var returnVal		= false;
var language		= new Array();
language["header"]	= "The following error(s) occured:"
language["start"]	= "->";
language["field"]	= " ";
language["require"]	= " is required";
language["min"]		= " and must consist of at least ";
language["max"]		= " and must not contain more than ";
language["minmax"]	= " and no more than ";
language["chars"]	= " characters";
language["num"]		= " and must contain a number";
language["email"]	= " must contain a valid e-mail address";
language["phone"] 	= " must contain a valid phone number (e.g. 310-555-3333)";
// -----------------------------------------------------------------------------
// define - Call this function in the beginning of the page. I.e. onLoad.
// n = name of the input field (Required)
// type= string, num, email (Required)
// min = the value must have at least [min] characters (Optional)
// max = the value must have maximum [max] characters (Optional)
// d = (Optional)
// -----------------------------------------------------------------------------
function define(n, type, HTMLname, min, max, d) {
var p;
var i;
var x;
if (!d) d = document;
if ((p=n.indexOf("?"))>0&&parent.frames.length) {
d = parent.frames[n.substring(p+1)].document;
n = n.substring(0,p);
}
if (!(x = d[n]) && d.all) x = d.all[n];
for (i = 0; !x && i < d.forms.length; i++) {
x = d.forms[i][n];
}
for (i = 0; !x && d.layers && i < d.layers.length; i++) {
x = define(n, type, HTMLname, min, max, d.layers[i].document);
return x;       
}
eval("V_"+n+" = new formResult(x, type, HTMLname, min, max);");
checkObjects[eval(checkObjects.length)] = eval("V_"+n);
}
function formResult(form, type, HTMLname, min, max) {
this.form = form;
this.type = type;
this.HTMLname = HTMLname;
this.min  = min;
this.max  = max;
}
function validate() 
{
	
	if (checkObjects.length > 0) 
	{
		errorObject = "";
	
		for (i = 0; i < checkObjects.length; i++) 
		{
			validateObject = new Object();
			validateObject.form = checkObjects[i].form;
			validateObject.HTMLname = checkObjects[i].HTMLname;
			validateObject.val = checkObjects[i].form.value;
			validateObject.len = checkObjects[i].form.value.length;
			validateObject.min = checkObjects[i].min;
			validateObject.max = checkObjects[i].max;
			validateObject.type = checkObjects[i].type;

			if (validateObject.type == "num" || validateObject.type == "string") 
			{
					if (
							(validateObject.type == "num" && validateObject.len <= 0) || 
							(validateObject.type == "num" && isNaN(validateObject.val))
						) 
					{ 
						errors += language['start'] + language['field'] + 
									validateObject.HTMLname + language['require'] + language['num'] + "\n";
					} else if (						
									validateObject.min && validateObject.max && 
									(validateObject.len < validateObject.min || 
									 validateObject.len > validateObject.max)
								) 
					{ 
						errors += language['start'] + language['field'] + 
								validateObject.HTMLname + language['require'] + language['min'] + 
								validateObject.min + language['minmax'] + 
								validateObject.max+language['chars'] + "\n";
					} else if (
							   validateObject.min && !validateObject.max && (validateObject.len < validateObject.min)
							   ) 
					{ 
						errors += language['start'] + language['field'] + validateObject.HTMLname + 
									language['require'] + language['min'] + validateObject.min + 
									language['chars'] + "\n";
					} else if (
							   	validateObject.max && !validateObject.min &&
								(validateObject.len > validateObject.max)
								) 
					{
						errors += language['start'] + language['field'] + 
								validateObject.HTMLname + language['require'] + language['max'] + 
								validateObject.max + language['chars'] + "\n";
					} else if (
							   	!validateObject.min && !validateObject.max && 
								validateObject.len <= 0
								) 
					{
							errors += language['start'] + language['field'] + 
										validateObject.HTMLname + language['require'] + "\n";
		   			}
				} 
				else if (validateObject.type == "phone")
				{

					myregexp = 	/^[\(]?[0123456789]{3}[\)]?[ -]*[0123456789]{3}[ -]*[0123456789]{4}$/;
					if (
							!myregexp.test(validateObject.val)
							)
					{
						errors += language['start'] + language['field'] + 
									validateObject.HTMLname + language['phone'] + "\n";

					}
				}
				else if(validateObject.type == "email") 
				{
					// Checking existense of "@" and ".". 
					// Length of must >= 5 and the "." must 
					// not directly precede or follow the "@"
					if (
							(validateObject.val.indexOf("@") == -1) || 
							(validateObject.val.charAt(0) == ".") || 
							(validateObject.val.charAt(0) == "@") || 
							(validateObject.len < 6) || 
							(validateObject.val.indexOf(".") == -1) || 
							(validateObject.val.charAt(validateObject.val.indexOf("@")+1) == ".") || 
							(validateObject.val.charAt(validateObject.val.indexOf("@")-1) == ".")
							) 
					{
						errors += 	language['start'] + language['field'] + 
									validateObject.HTMLname + language['email'] + "\n"; 
					}
			  	}
		   }
		}
		
		if (errors) 
		{
			alert(language["header"].concat("\n" + errors));
			errors = "";
			returnVal = false;
		} else {
			returnVal = true;
		}
		
}