var request = false;
try {
	request = new XMLHttpRequest();
} catch (trymicrosoft) {
	try {
	request = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (othermicrosoft) {
	try {
		request = new ActiveXObject("Microsoft.XMLHTTP");
	} catch (failed) {
		request = false;
	}
	}
}

if (!request) { alert("Error initializing XMLHttpRequest!"); }
	

function select_subcat(sel,cat_val) {
	var url = ("/catalog_subcategory/?select=" + sel + "&id=" + cat_val);

	request.open("GET", url, true);
	request.onreadystatechange = updatePage;
	request.send(null);
}



function updatePage() {
	
	if (request.readyState == 4) {
		if (request.status == 200) {
			var response = request.responseText.split("|");
			if (response[0] == 1) {
				elem = "mid_chemsubcat";
			} else {
				elem = "side_chemsubcat";
			}
			document.getElementById(elem).innerHTML = response[1];
		} else if (request.status == 404) {
			alert("Request URL does not exist");
		} else {
			alert("Error: status code is " + request.status);
		}
	}
}

function validateForm(form_data) {
	//req_fields= array('product','fname','lname','phone','email','message');
	var err = "";
	err += isEmpty(form_data.product.value,"Product");
	err += isEmpty(form_data.fname.value,"First Name");
	err += isEmpty(form_data.lname.value,"Last Name");
	err += checkPhone(form_data.phone.value);
	err += checkEmail(form_data.email.value);
	err += isEmpty(form_data.message.value,"Query");
	
	if (err != "") {
		alert (err);
		return false;
	}
	return true;
	
}

// Copyright © 2001 by Apple Computer, Inc., All Rights Reserved.
//
// You may incorporate this Apple sample code into your own code
// without restriction. This Apple sample code has been provided "AS IS"
// and the responsibility for its operation is yours. You may redistribute
// this code, but you are not permitted to redistribute it as
// "Apple sample code" after having made changes.

// email

function checkEmail (strng) {
    var error="";

    if (strng == "") { error = "You didn't enter an email address.\n"; }
    else {
        var emailFilter=/^.+@.+\..{2,3}$/;
        if (!(emailFilter.test(strng))) { error = "Please enter a valid email address.\n"; }
        else {
            //test email for illegal characters
            var illegalChars= /[\(\)\<\>\,\;\:\\\"\[\]]/
            if (strng.match(illegalChars)) { error = "The email address contains illegal characters.\n"; }
        }
    }
    return error;    
}


// phone number - strip out delimiters and check for 10 digits

function checkPhone (strng) {
    var error = "";

    if (strng == "") { error = "You didn't enter a phone number.\n"; }
    else {
        var stripped = strng.replace(/[\(\)\.\-\ ]/g, ''); //strip out acceptable non-numeric characters
        if (isNaN(parseInt(stripped))) { error = "The phone number contains illegal characters.\n"; }
//        if (!(stripped.length == 10)) {
//            error = "The phone number is the wrong length. Please make sure you included an area code.\n";
//        } 
    }
    return error;
}


// password - between 6-8 chars, uppercase, lowercase, and numeral

function checkPassword (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a password.\n";
}

    var illegalChars = /[\W_]/; // allow only letters and numbers
    
    if ((strng.length < 6) || (strng.length > 8)) {
       error = "The password is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
      error = "The password contains illegal characters.\n";
    } 
    else if (!((strng.search(/(a-z)+/)) && (strng.search(/(A-Z)+/)) && (strng.search(/(0-9)+/)))) {
       error = "The password must contain at least one uppercase letter, one lowercase letter, and one numeral.\n";
    }  
return error;    
}    


// username - 4-10 chars, uc, lc, and underscore only.

function checkUsername (strng) {
var error = "";
if (strng == "") {
   error = "You didn't enter a username.\n";
}


    var illegalChars = /\W/; // allow letters, numbers, and underscores
    if ((strng.length < 4) || (strng.length > 10)) {
       error = "The username is the wrong length.\n";
    }
    else if (illegalChars.test(strng)) {
    error = "The username contains illegal characters.\n";
    } 
return error;
}       


// non-empty textbox

function isEmpty(strng,field) {
var error = "";
  if (strng.length == 0) {
     error = "The " + field + " field has not been filled in.\n"
  }
return error;	  
}

// was textbox altered

function isDifferent(strng) {
var error = ""; 
  if (strng != "Can\'t touch this!") {
     error = "You altered the inviolate text area.\n";
  }
return error;
}

// exactly one radio button is chosen

function checkRadio(checkvalue) {
var error = "";
   if (!(checkvalue)) {
       error = "Please check a radio button.\n";
    }
return error;
}

// valid selector from dropdown list

function checkDropdown(choice) {
var error = "";
    if (choice == 0) {
    error = "You didn't choose an option from the drop-down list.\n";
    }    
return error;
}