function isEmpty(pString){
		if (pString==null || pString==""){
			return true;
		} else{
			return false;
		}
}

function isSize(pString,pmin,pmax){
	if((pString.length < pmin) || (pString.length >pmax)){
		return false;
	} else {
		return true;
	}
}


function emailCheck (emailStr) {
/* The following pattern is used to check if the entered e-mail address
   fits the user@domain format.  It also is used to separate the username
   from the domain. */
var emailPat=/^(.+)@(.+)$/
/* The following string represents the pattern for matching all special
   characters.  We don't want to allow special characters in the address. 
   These characters include ( ) < > @ , ; : \ " . [ ]    */
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
/* The following string represents the range of characters allowed in a 
   username or domainname.  It really states which chars aren't allowed. */
var validChars="\[^\\s" + specialChars + "\]"
/* The following pattern applies if the "user" is a quoted string (in
   which case, there are no rules about which characters are allowed
   and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
   is a legal e-mail address. */
var quotedUser="(\"[^\"]*\")"
/* The following pattern applies for domains that are IP addresses,
   rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
   e-mail address. NOTE: The square brackets are required. */
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
/* The following string represents an atom (basically a series of
   non-special characters.) */
var atom=validChars + '+'
/* The following string represents one word in the typical username.
   For example, in john.doe@somewhere.com, john and doe are words.
   Basically, a word is either an atom or quoted string. */
var word="(" + atom + "|" + quotedUser + ")"
// The following pattern describes the structure of the user
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
/* The following pattern describes the structure of a normal symbolic
   domain, as opposed to ipDomainPat, shown above. */
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")


/* Finally, let's start trying to figure out if the supplied address is
   valid. */

/* Begin with the coarse pattern to simply break up user@domain into
   different pieces that are easy to analyze. */
var matchArray=emailStr.match(emailPat)
if (matchArray==null) {
  /* Too many/few @'s or something; basically, this address doesn't
     even fit the general mould of a valid e-mail address. */
	return("Email address seems incorrect (check @ and .'s)")
}
var user=matchArray[1]
var domain=matchArray[2]

// See if "user" is valid 
if (user.match(userPat)==null) {
    // user is not valid
    return("The username doesn't seem to be valid.")
}

/* if the e-mail address is at an IP address (as opposed to a symbolic
   host name) make sure the IP address is valid. */
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
    // this is an IP address
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
	        return("Destination IP address is invalid!")
	    }
    }
    return true
}

// Domain is symbolic name - REMOVED AS IT DOES NOT MATCH .gov.uk
/*var domainArray=domain.match(domainPat)
if (domainArray==null) {
	return("The domain name doesn't seem to be valid.")
}
*/
/* domain name seems valid, but now make sure that it ends in a
   three-letter word (like com, edu, gov) or a two-letter word,
   representing country (uk, nl), and that there's a hostname preceding 
   the domain or country. */

/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>4) { // changed from 3 to 4 for .coop domain
   // the address must end in a two letter or three letter word.
	return("The address must end in a three-letter domain, or two letter country.")
}

// Make sure there's a host name preceding the domain.
if (len<2) {
   var errStr="This address is missing a hostname!"
	return(errStr)
 }

// If we've gotten this far, everything's valid!
return true;
}	
	
function getSelectedValue(pList) {
	
	len = pList.length
	i = 0
	chosen = "none"
	
	for (i = 0; i < len; i++) {
	if (pList[i].selected) {
		chosen = pList[i].value;
	}
	}
	
	return chosen
}


function checkInputForm(pForm,pFieldList){
		
	 var pFieldList = (pFieldList == null) ? "" : pFieldList;
	
	// To get this to work you need to mark up as follows
	
	// <input type="hidden" id="compulsoryFields" value = "field1,field2,field3">
	// <span id="field1_span">Some text<input type="text" id="field1" name="anythingyouwant" value=""></span>
	//css should have a class of question_text for standard look and missed_compulsory for what to look like when missed
	

	// check that any compulsory fields are completed
			
	if(pFieldList == ""){			
		questionToCheckList = document.getElementById("compulsoryFields"); // so should be a list of fields that we should check (comma separated)
		var arrQuestionToCheck = questionToCheckList.value.split(",");
	} else {		
		var arrQuestionToCheck = pFieldList.split(",");
	}
			
	allCompleted = true;
	countMissed = 0;

	for (var i=0; i < arrQuestionToCheck.length; i++){ // loop through all of the questions to check
		
		questionName = arrQuestionToCheck[i];
				
		if(responsesToCheck = document.getElementById(questionName)){
			; // need to check that one of these responses has been set
			spanVarName = questionName + "_span";
		} else {
			alert("SETUP ERROR - Looking for question with ID of " + questionName + " but it does not exist.");
		}
		
		
		switch(responsesToCheck.type){ // dependant on the sort of responses we need to check differently
			
			case "radio":
				//loop round the radio buttons that have a name of arrTemplateVars[this question_id]
				
				foundOne = false;
				for (var j=0; j<responsesToCheck.length; j++){

					foo = responsesToCheck[j].checked; // gives us true or false if this option has been checked
					if (foo) {
						foundOne=true; // we've answered this question
					}
				}
				if(!foundOne){
					// recognise we have a missing question
					allCompleted = false ;
					countMissed++; // just to help with question versus questions
					
					// change the class of the span around the question to "missed_compulsory"
					
					questionMissedSpan = document.getElementById(spanVarName);
					questionMissedSpan.className = "missed_compulsory"; // css picks this up and optionally changes how the question is presented
					
				} else {
					// change the class of the question to "missed_compulsory"
					questionMissedSpan = document.getElementById(spanVarName);
					questionMissedSpan.className = "question_text"; // css picks this up and optionally changes how the question is presented
					
				}
				break;
			
			case "select-one":
			
				if(responsesToCheck.selectedIndex==0){
					allCompleted = false;
					countMissed++;
					if(questionMissedSpan = document.getElementById(spanVarName)){						
						questionMissedSpan.className = "missed_compulsory"; // css picks this up and optionally changes how the question is presented
					} else {
						alert("SETUP ERROR - Unable to get object for ID " + spanVarName);
						
					}
					
				} else {
					// change the class of the question to "missed_compulsory"
					questionMissedSpan = document.getElementById(spanVarName);
					questionMissedSpan.className = "question_text"; // css picks this up and optionally changes how the question is presented
					
				}
				break;
			
			
			case "checkbox": //care this will force something to be ticked!
			
				if(!responsesToCheck.checked){
					allCompleted = false;
					countMissed++;
					questionMissedSpan = document.getElementById(spanVarName);
					questionMissedSpan.className = "missed_compulsory"; // css picks this up and optionally changes how the question is presented
					
				} else {
					// change the class of the question to "missed_compulsory"
					questionMissedSpan = document.getElementById(spanVarName);
					questionMissedSpan.className = "question_text"; // css picks this up and optionally changes how the question is presented
					
				}
				break;
		
			default:
							
				// copes with text fields
				if(isEmpty(responsesToCheck.value)){
					
					allCompleted = false;
					countMissed ++;				
					
					if(questionMissedSpan = document.getElementById(spanVarName)){						
						questionMissedSpan.className = "missed_compulsory"; // css picks this up and optionally changes how the question is presented
					} else {
						alert("SETUP ERROR - Unable to get object for ID " + spanVarName);						
					}
										
					
				} else {
					// change the class of the question to "missed_compulsory"
					questionMissedSpan = document.getElementById(spanVarName);
					questionMissedSpan.className = "missed_compulsory"; // css picks this up and optionally changes how the question is presented
					questionMissedSpan.className = "question_text"; // css picks this up and optionally changes how the question is presented
					
				}
			break;
			
		}
		
	}
	
	if(allCompleted){
		return true;
	} else {		
		return false; // stop proceeding
	}
	
}




function checkOnePickedFromDropDown(form){
	
	for (i=0;i<form.elements.length;i++){
		
		if(form.elements[i].type=="select-one" && form.elements[i].selectedIndex==0){
			alert("Please review your selections");
			return false;
		}
	}
	return true;
	
}

function wordCount(inputString){

  var a = inputString.split(/\s+/g);
  return a.length;

}

function minMaxCheck(pForm, pmin, pmax) {

	var numChecked=0;
	var toCheck = pForm.length;
	
	for (i=0;i < toCheck ;i++){	
				
		if(pForm.elements[i].type == "checkbox"){
			if (pForm.elements[i].checked == true){
				numChecked++;
			}
		}

	}
	
	if (numChecked > pmax){
		alert('You are only allowed to select ' + pmax);
		return false;
	} else if (numChecked < pmin) {
		alert('You must select at least ' + pmin);
		return false;
	}
	
	return true;
	
}

function checkWordCount(field,count) {
	
	var wordsToCheck = document.getElementById(field).value;
	var arrWords = wordsToCheck.split(/\b[\s,\.-:;]*/);
	var numWords = arrWords.length;
	if(numWords > count){
		alert ("Please keep text under the " + count + " word limit");
		return false;
	} else {
		return true;
	}
	
}