var result = true;

function addErrorLine(arg_error_txt) {
	if(!document.getElementById('error_box')) createErrorBox();
	
	var error_box = document.getElementById('error_box');
	var error_list = error_box.getElementsByTagName('ul')[0];
	
	var error_item = document.createElement('li');
	var error_text = document.createTextNode(arg_error_txt);
	
	
	error_item.appendChild(error_text);
	error_list.appendChild(error_item);
}

function createErrorBox() {
	var the_form = document.getElementsByTagName('form')[0];
	var error_box = document.createElement('div');
	var error_list = document.createElement("ul");
	
	error_box.style.background = '#333333';
	error_box.style.border = 'red 1px dashed';
	error_box.style.width = '400px';
	error_box.style.padding = '10px';
	error_box.style.marginBottom = '20px';
	
	error_box.setAttribute('id','error_box');
	error_box.appendChild(error_list);
	document.getElementById('container').insertBefore(error_box,the_form);
}

function clearErrorList() {
	if(document.getElementById("error_box")) {
		var error_box = document.getElementById('error_box');
		var error_list = error_box.getElementsByTagName('ul')[0];
		
		error_list.innerHTML = '';
	}
}

function validate_required(required_elements) {
	var result = true;
	
	for(var counter=0; counter<required_elements.length; counter++) {
		if(document.getElementById(required_elements[counter])) {
			if(trim(document.getElementById(required_elements[counter]).value) == "") {
				var thisField = document.getElementById(required_elements[counter]);
				addErrorLine("The field \"" + thisField.title + "\" is required.");
				result = false;
			}
			var current_element = document.getElementById(required_elements[counter]);
		}
	}
	
	return result;
}

function validate_email(email_elements) {
	var result = true;
	
	for(var counter=0; counter<email_elements.length; counter++) {
		if(document.getElementById(email_elements[counter])) {
			var thisField = document.getElementById(email_elements[counter]);
			if(thisField.value != "") {
				result = verifyEmail(thisField.value);
			}
		}
	}
	return result;
}

function verifyEmail(emailStr) {
	
	if (null == emailStr || trim(emailStr) == "") {
		return true;
	} else {
		<!-- V1.1.3: Sandeep V. Tamhankar (stamhankar@hotmail.com) -->
		<!-- Original:  Sandeep V. Tamhankar (stamhankar@hotmail.com) -->
		
		var checkTLD=1;
		var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
		var emailPat=/^(.+)@(.+)$/;
		var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
		var validChars="\[^\\s" + specialChars + "\]";
		var quotedUser="(\"[^\"]*\")";
		var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
		var atom=validChars + '+';
		var word="(" + atom + "|" + quotedUser + ")";
		var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
		var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
		var matchArray=emailStr.match(emailPat);
		
		if (matchArray==null) {
			addErrorLine("Email address seems incorrect (check @ and .'s)");
			return false;
		}
		var user=matchArray[1];
		var domain=matchArray[2];
	
		for (i=0; i<user.length; i++) {
			if (user.charCodeAt(i)>127) {
				addErrorLine("Email: Ths username contains invalid characters.");
				return false;
			}
		}
		
		for (i=0; i<domain.length; i++) {
			if (domain.charCodeAt(i)>127) {
				addErrorLine("Email: Ths domain name contains invalid characters.");
				return false;
			}
		}
		
		if (user.match(userPat)==null) {
			addErrorLine("Email: The username doesn't seem to be valid.");
			return false;
		}
		
		var IPArray=domain.match(ipDomainPat);
		
		if (IPArray!=null) {
			for (var i=1;i<=4;i++) {
				if (IPArray[i]>255) {
					addErrorLine("Email: Destination IP address is invalid!");
					return false;
				}
			}
			
			return true;
		}
		
		var atomPat=new RegExp("^" + atom + "$");
		var domArr=domain.split(".");
		var len=domArr.length;
		
		for (i=0;i<len;i++) {
			if (domArr[i].search(atomPat)==-1) {
				addErrorLine("Email: The domain name does not seem to be valid.");
				return false;
			}
		}
		
		if (checkTLD && domArr[domArr.length-1].length!=2 && 
			domArr[domArr.length-1].search(knownDomsPat)==-1) {
			addErrorLine("Email: The address must end in a well-known domain or two letter " + "country.");
			return false;
		}
		
		if (len<2) {
			addErrorLine("Email: This address is missing a hostname!");
			return false;
		}
		
		return true;
	}
}