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;
}

function validateNumber(val, min, max){
	if ( isNaN( val ) ) return false;
	if ( min && val < min ) return false;
	if ( max && val > max ) return false;
	return true;
}

function dateComponents(dateStr, format) {
	var results = new Array();
	var datePat = /^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2}|\d{4})$/;
	var matchArray = dateStr.match(datePat);
	
	if (matchArray == null) { 
		return null; 
	}
	//check for two digit (20th century) years and prepend 19.
	matchArray[4] = (matchArray[4].length == 2) ? '19' + matchArray[4] : matchArray[4];

	// parse date into variables
	if (format.charAt(0)=="d"){ //what format does the server use for dates? 
		results[0] = matchArray[1];
		results[1] = matchArray[3];
	} else { 
		results[1] = matchArray[1];
		results[0] = matchArray[3]; }
	results[2] = matchArray[4];
	return results;
}

function valiDate(obj, min, max, format){
	
	dateBits = dateComponents(obj.value, format);
	if (dateBits == null) return false;

//Check it is a valid date first
	day = dateBits[0];
	month = dateBits[1];
	year = dateBits[2];

	if ((month < 1 || month > 12) || (day < 1 || day > 31)) { // check month range 
		return false;
	} 
	if ((month==4 || month==6 || month==9 || month==11) && day==31) {
		return false;
	}
	if (month == 2) {
	// check for february 29th 
		var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); 
		if (day>29 || (day==29 && !isleap)) {
			return false;
		}
	} 

//Now check whether a range is specified and if in bounds
	var theDate = new Date(dateBits[2], parseInt(dateBits[1]) - 1, dateBits[0]);

	if ( min ) {
		minBits = dateComponents (min, format);
		var minDate = new Date(minBits[2], parseInt(minBits[1]) - 1, minBits[0]);
		if ( minDate.getTime() > theDate.getTime() ) return false;
	} 
	if ( max) {
		maxBits = dateComponents (max, format);
		var maxDate = new Date(maxBits[2], parseInt(maxBits[1]) - 1, maxBits[0]);
		if ( theDate.getTime() > maxDate.getTime() ) return false;
	}
	return true;
}

function validateEmail( obj ) {
	var emailStr = obj.value;
	var reg1 = /(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/; // not valid
	var reg2 = /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/; // valid
	if ( !reg1.test( emailStr ) && reg2.test( emailStr ) ) {
		return true;
	} else {
	 	return false;
	}
}

function validatePassword( obj ) {
	var pwdStr = obj.value;
	var reg1 = /[a-z]/ ;
	var reg2 = /[A-Z]/ ;
	var reg3 = /[0-9]/ ;
	if ( reg1.test( pwdStr ) && reg2.test( pwdStr ) && reg3.test( pwdStr ) && pwdStr.length > 7) {
		return true;
	} else {
	 	return false;
	}
}

function validateMatch( obj1, obj2 ) {
	var pwdStr1 = obj1.value;
	var pwdStr2 = obj2.value;
	if ( pwdStr1 == pwdStr2) {
		return true;
	} else {
	 	return false;
	}
}

function validateChoose( obj1 ) {
	var inputStr1 = obj1.value;
	if ( inputStr1 == 'Choose from list') {
		return false;
	} else {
	 	return true;
	}
}


function locateFileUpload( f ) {
 for(var i = 0; i < f.elements.length; i ++)
  if( f.elements[i].type=='file' ){
  return f.elements[i];
 }
}

function validateFileType( obj, fTyp ) {

dots = obj.value.split(".");
fType = "." + dots[dots.length-1];

if ( fTyp != null && fTyp.indexOf(fType) == -1 ) return false;

return true;
}

function validateFileLimit( obj, cur, max ) {

if ( cur >= max ) return false;

return true;
}

function OnFailure( obj, lbl, msg ){
	var msgs = new Array();
	msgs["text"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease enter a value.";
	msgs["textarea"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease enter a value.";
	msgs["select-one"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease select an entry.";
	msgs["select-multiple"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease select an entry.";
	msgs["checkbox"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease select an entry.";
	msgs["file"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease select a file.";
	msgs["fileType"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease select a valid file type.";
	msgs["fileLimit"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease reduce number of attachment(s) first.";
	msgs["radio"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease select an entry.";
	msgs["number"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease enter a valid number.";
	msgs["date"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease enter a valid date.";
	msgs["email"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease enter a valid e-mail address.";
	msgs["choose"] = "\n\n All marked fields must be completed in order to submit this form. \n\nYou must choose a value from the list.";
	msgs["passwordcheck"] = "\n\n All marked fields must be completed in order to submit this form. \n\nPlease enter a valid password.";
	msgs["passwordmatch"] = "Passwords do not match!\n\n All marked fields must be completed in order to submit this form. \n\nPlease enter a valid password.";

	if(msg[1]	|| msg[2]){ //upper/lower bound ranges have been specified
		if(msg[1]	&& msg[2]){//range
			term = ( msg[0] == "date" )? " ("+msg[3]+")" : "";
			alert(lbl + msgs[msg[0]] + term + " between " + msg[1] + " and " + msg[2]);
		} else if (msg[1]) {//lower bound
			term = ( msg[0] == "number" ) ? " greater than " : " (" + msg[3] + ") after ";
			alert(lbl + msgs[msg[0]] + term + msg[1]);
		} else {//upper bound
			term = ( msg[0] == "number" )? " less than " : " (" + msg[3] + ") before ";
			alert(lbl + msgs[msg[0]] + term + msg[2]);
		}
	} else {//no range given
		alert(lbl + msgs[msg[0]]);
	}
	
	obj.focus();
	return false;
}

function isSomethingSelected( obj ){
	for (var r=0; r < obj.length; r++){
		if ( obj[r].checked ) return true;
	}
}

function validateRequiredFields( f, a ){

	for (var i=0; i < a.length; i++){
		e = a[i][0];
			//checks input types: "text","select-one","select-multiple","textarea","checkbox","radio","file","password"
//alert(e.type)
				switch (e.type) {
					case "text":
							if ((e.value == "" ) || (e.value == null) || isblank(e.value)) return OnFailure(e, a[i][1], ["text"]);
							if ( a[i][2] ) {
								switch ( a[i][2][0] ){
									case "number":
										if ( !validateNumber(e.value, a[i][2][1], a[i][2][2]) ) return OnFailure(e, a[i][1], ["number", a[i][2][1], a[i][2][2]]);
										break
									case "date":
										if ( !valiDate(e, a[i][2][1], a[i][2][2], a[i][2][3]) ) return OnFailure(e, a[i][1], ["date", a[i][2][1], a[i][2][2], a[i][2][3]]);
										break
									case "email":
										if ( !validateEmail(e) ) return OnFailure(e, a[i][1], ["email"]);
										break
									case "choose":
										if ( !validateChoose(e) ) return OnFailure(e, a[i][1], ["choose"]);
										break 
									default:
										break
								}
							}
						break
					case "file":
					//make sure AT LEAST one file gets attached
					if ( a[i][2][1] == 0 && ((e.value == "" ) || (e.value == null) || isblank(e.value)) ) return OnFailure(e, a[i][1], ["file"]);
					if ( ((e.value == "" ) || (e.value == null) || isblank(e.value)) != "") {
						//check type of file that is being uploaded
						if ( a[i][2][0] != null && validateFileType( e, a[i][2][0] ) == false ) return OnFailure(e, a[i][1], ["fileType"]);
						//check that file limit has not been reached
						if ( a[i][2][2] != null && validateFileLimit( e, a[i][2][1], a[i][2][2] ) == false ) return OnFailure(e, a[i][1], ["fileLimit"]);
					}
						break
					case "textarea":
					if ((e.value == "" ) || (e.value == null) || isblank(e.value)) return OnFailure(e, a[i][1], ["textarea"]);
						break
					case "select-one":
					if ( e.selectedIndex == 0 ) return OnFailure(e, a[i][1], ["select-one"]);
						break
					case "select-multiple":
					if (e.selectedIndex == -1) return OnFailure(e, a[i][1], ["select-multiple"]);
						break
 					case "password":
							if ( !validatePassword(e) ) return OnFailure(e, a[i][1], ["passwordcheck"]);
							if ( !validateMatch(e, a[i][3]) ) return OnFailure(e, '', ["passwordmatch"]);
	  			break
					default:
						//must be a checkbox or a radio group if none of above

 						if ( !e[0]) {//handle single item group first
							switch (e.type) {
							case "checkbox":
								if ( !e.checked )  return OnFailure(e, a[i][1], ["checkbox"]);
								break
							case "radio":
								if ( !e.checked )  return OnFailure(e, a[i][1], ["radio"]);
								break
							default:
									break
							}
						} else { //handle multi-item groups
							switch (e[0].type) {
							case "checkbox":
								if ( !isSomethingSelected( e ) )  return OnFailure(e[0], a[i][1], ["checkbox"]);
								break
							case "radio":
								if ( !isSomethingSelected( e ) )  return OnFailure(e[0], a[i][1], ["radio"]);
								break
							default:
									break
							}
						}
						break
				}
	}
	return true;
}