/*YIM*/

/*PRELOAD IMAGES */
//v3.0
function MM_swapImgRestore() { 
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}
//v3.0
function MM_preloadImages() { 
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}
//v4.01
function MM_findObj(n, d) { 
  var p,i,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=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
//v3.0
function MM_swapImage() {
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

/*OPEN EXTERNAL LINKS*/
function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "external")
     anchor.target = "_blank";
 }
}

/*POPS*/
function popUp(URL) {
	day = new Date();
	id = day.getTime();
	eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=1,width=550,height=780');");
}

// POSTCODE CHECK
function checkPostCode (toCheck) {

  // Permitted letters depend upon their position in the postcode.
  var alpha1 = "[abcdefghijklmnoprstuwyz]";                       // Character 1
  var alpha2 = "[abcdefghklmnopqrstuvwxy]";                       // Character 2
  var alpha3 = "[abcdefghjkpmnrstuvwxy]";                         // Character 3
  var alpha4 = "[abehmnprvwxy]";                                  // Character 4
  var alpha5 = "[abdefghjlnpqrstuwxyz]";                          // Character 5
  
  // Array holds the regular expressions for the valid postcodes
  var pcexp = new Array ();

  // Expression for postcodes: AN NAA, ANN NAA, AAN NAA, and AANN NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "?[0-9]{1,2})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  
  // Expression for postcodes: ANA NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}[0-9]{1}" + alpha3 + "{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));

  // Expression for postcodes: AANA  NAA
  pcexp.push (new RegExp ("^(" + alpha1 + "{1}" + alpha2 + "{1}" + "?[0-9]{1}" + alpha4 +"{1})(\\s*)([0-9]{1}" + alpha5 + "{2})$","i"));
  
  // Exception for the special postcode GIR 0AA
  pcexp.push (/^(GIR)(\s*)(0AA)$/i);
  
  // Standard BFPO numbers
  pcexp.push (/^(bfpo)(\s*)([0-9]{1,4})$/i);
  
  // c/o BFPO numbers
  pcexp.push (/^(bfpo)(\s*)(c\/o\s*[0-9]{1,3})$/i);
  
  // Overseas Territories
  pcexp.push (/^([A-Z]{4})(\s*)(1ZZ)$/i);

  // Load up the string to check
  var postCode = toCheck;

  // Assume we're not going to find a valid postcode
  var valid = false;
  
  // Check the string against the types of post codes
  for ( var i=0; i<pcexp.length; i++) {
    if (pcexp[i].test(postCode)) {
    
      // The post code is valid - split the post code into component parts
      pcexp[i].exec(postCode);
      
      // Copy it back into the original string, converting it to uppercase and
      // inserting a space between the inward and outward codes
      postCode = RegExp.$1.toUpperCase() + " " + RegExp.$3.toUpperCase();
      
      // If it is a BFPO c/o type postcode, tidy up the "c/o" part
      postCode = postCode.replace (/C\/O\s*/,"c/o ");
      
      // Load new postcode back into the form element
      valid = true;
      
      // Remember that we have found that the code is valid and break from loop
      break;
    }
  }
  
  // Return with either the reformatted valid postcode or the original invalid 
  // postcode
  if (valid) {return postCode;} else return false;
}

// PHONE VALIDATION

// Declaring required variables
var digits = "0123456789";
// non-digit characters which are allowed in phone numbers
var phoneNumberDelimiters = "()- ";
// characters which are allowed in international phone numbers
// (a leading + is OK)
var validWorldPhoneChars = phoneNumberDelimiters + "+";
// Minimum no of digits in an international phone no.
var minDigitsInIPhoneNumber = 10;

function isInteger(s) {   
	var i;
    for (i = 0; i < s.length; i++) {   
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function trim(s) {   var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not a whitespace, append to returnString.
    for (i = 0; i < s.length; i++) {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (c != " ") returnString += c;
    }
    return returnString;
}

function stripCharsInBag(s, bag) {   
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++) {   
        // Check that current character isn't whitespace.
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone){
	var bracket=3
	strPhone=trim(strPhone)
	if(strPhone.indexOf("+")>1) return false
	if(strPhone.indexOf("-")!=-1)bracket=bracket+1
	if(strPhone.indexOf("(")!=-1 && strPhone.indexOf("(")>bracket)return false
	var brchr=strPhone.indexOf("(")
	if(strPhone.indexOf("(")!=-1 && strPhone.charAt(brchr+2)!=")")return false
	if(strPhone.indexOf("(")==-1 && strPhone.indexOf(")")!=-1)return false
	s=stripCharsInBag(strPhone,validWorldPhoneChars);
	return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}

/*CALL BACK*/
function SignUp(form) {
	if(form.firstname.value == '') {
		alert('Please fill in your first name.');
		form.firstname.focus();
		return false;
	}	
	if(form.lastname.value == '') {
		alert('Please fill in your last name.');
		form.lastname.focus();
		return false;
	}	
	if(form.contactemail.value == '') {
		alert('Please fill in your email.');
		form.contactemail.focus();
		return false;
	}	
	if(!(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(form.contactemail.value))) {
		alert('Email address is invalid.\nPlease check and change.');
		form.contactemail.value="";
		form.contactemail.focus();
		return false;
	}
	if ((form.contactnumber.value==null)||(form.contactnumber.value=="")){
		alert("Please fill in a contact number.");
		form.contactnumber.focus()
		return false
	}
	if (checkInternationalPhone(form.contactnumber.value)==false){
		alert("Please give a valid number.");
		form.contactnumber.value="";
		form.contactnumber.focus();
		return false;
	}
	/*
	if(form.facebookname.value == '') {
		alert('Please provide your Facebook Username - we will be checking!');
		form.facebookname.focus();
		return false;
	}	
	if(form.address.value == '') {
		alert('Please fill in your address:\nhouse name or number and street name');
		form.address.focus();
		return false;
	}	
	if(form.postcode.value == '') {
		alert('Please fill in your postcode.');
		form.postcode.focus();
		return false;
	} 
	var myPostCode = form.postcode.value;
  	if (checkPostCode (myPostCode)) {
		form.postcode.value = checkPostCode (myPostCode)
		//alert ("Postcode good and accepted.");
	}
	else {
		alert ("Postcode invalid.\nPlease check and change.");
		form.postcode.value="";
		form.postcode.focus();
		return false;
  	}
	if(form.dob.value == '') {
		alert('Please fill in your Date of Birth in the format dd/mm/yyyy.');
		form.dob.focus();
		return false;
	}
	var chosentheme = false;
	for (i = 0;  i < form.chosentheme.length;  i++) {
		if (form.chosentheme[i].checked)
		chosentheme = true;
	}
	if (!chosentheme) {
		alert("Please select the theme you chose");
		return false;
	}	
	if(form.artworkname.value == '') {
		alert('Please tell us the name of your piece.');
		form.artworkname.focus();
		return false;
	}	
	if(form.aboutartwork.value == '') {
		alert('Please tell us about your piece - a description.');
		form.aboutartwork.focus();
		return false;
	}	
	if (form.giveconsent.checked == false){
		alert("Do you agree to our terms?\nPlease give your consent by ticking the box.");
		return false;
	}	
	*/
    return true;
}

/*ENABLE MULTIPLE LOADS WITHOUT PLACING 3 FTNS IN BODY TAG*/
function start() {
  externalLinks();
  MM_preloadImages();
}
window.onload = start;