// A utility function that returns true if a string contains only 
// whitespace characters.
function isblank(s)
{
    for(var i = 0; i < s.length; i++) {
        var c = s.charAt(i);
        if ((c != ' ') && (c != '\n') && (c != '\t')) return false;
    }
    return true;
}

// This is the function that performs form verification. It will be invoked
// from the onSubmit() event handler. The handler should return whatever
// value this function returns.
// idename is the  name of the user
// ideuname is the username
// idepname is the password
function verify(f)
{
    var msg;
    var empty_fields = "";
    var errors = "";

    // Loop through the elements of the form, looking for all 
    // text and textarea elements that don't have an "optional" property
    // defined. Then, check for fields that are empty and make a list of them.
    // Also, if any of these elements have a "min" or a "max" property defined,
    // then verify that they are numbers and that they are in the right range.
    // Put together error messages for fields that are wrong.
    for(var i = 0; i < f.length; i++) {
        var e = f.elements[i];
        if (((e.type == "text") || (e.type == "textarea") || (e.type == "password")) && !e.optional) {
            // first check if the field is empty
            if ((e.value == null) || (e.value == "") || isblank(e.value)) {
                empty_fields += "\n          " + e.name;
                continue;
            }

            // Now check for fields that are supposed to be numeric.
            if (e.numeric || (e.min != null) || (e.max != null)) { 
                var v = parseFloat(e.value);
                if (isNaN(v) || 
                    ((e.min != null) && (v < e.min)) || 
                    ((e.max != null) && (v > e.max))) {
                    errors += "- The field " + e.name + " must be a number";
                    if (e.min != null) 
                        errors += " that is greater than " + e.min;
                    if (e.max != null && e.min != null) 
                        errors += " and less than " + e.max;
                    else if (e.max != null)
                        errors += " that is less than " + e.max;
                    errors += ".\n";
                }
            }
        }
    }
   
   if (!empty_fields){
   i=0;
   var userorder=0;
   while (ideuname[i] != f.elements[0].value && ideuname[i] != null){i++;}
   if (ideuname[i] == null){
      errors += "el Usuario: "+f.elements[0].value+" no existe. Pruebe de nuevo";
      errors += "\n";}
   if (ideuname[i]== f.elements[0].value && idepname[i] != f.elements[1].value){
      errors += "Hola "+idename[i]+" la Contraseņa es incorrecta. Prueba de nuevo";
      errors += "\n";}
   if (ideuname[i] == f.elements[0].value && idepname[i] == f.elements[1].value){
	userorder=i;
	// storing dummy userorder variable
	var userordrem = new Cookie(document, "userorddum" , 600);
	userordrem.order=userorder;
	userordrem.store();
	}}


    // Now, if there were any errors, display the messages, and
    // return false to prevent the form from being submitted. 
    // Otherwise return true.
    if (!empty_fields && !errors){return true;}

    msg  = "______________________________________________________\n\n"
    msg += "La peticion no se puede enviar pues tiene los siguientes errores.\n";
    msg += "Por favor corrijalos y reenviela.\n";
    msg += "______________________________________________________\n\n"

    if (empty_fields) {
        msg += "- Los siguientes campos estan vacios:"
                + empty_fields + "\n";
        if (errors) msg += "\n";
    }
    msg += errors;
    alert(msg);
    return false;
}
//------------------------------------------------------------------------
//     Here's a sample form to test our verification with. Note that we
//     call verify() from the onSubmit() event handler, and return whatever
//     value it returns. Also note that we use the onSubmit() handler as
//     an opportunity to set properties on the form objects that verify()
//     will use in the verification process. 
//-------------------------------------------------------------------------