function showMessage(id, errors) {
	if(errors) {
		document.getElementById(id).style.display='inline';
		hasErrors = true;
	} else
		document.getElementById(id).style.display='none';
}

function checkLength(object,minLength,maxLength,errorLoc,critic) {
	showMessage(errorLoc, false);
	if (object.value.length < minLength) {
		showMessage(errorLoc, true);
		if(critic) return false;
	}else if (object.value.length > maxLength) {
		showMessage(errorLoc, true);
		if(critic) return false;
	}
	
	return true;
}

function checkFilled(object,errorLoc,critic) {
	showMessage(errorLoc, false);
	if (object.value.length < 1) {
		showMessage(errorLoc, true);
		if(critic) return false;
	}

	return true;
}

function checkDoubleFilled(object,other,errorLoc,critic) {
	showMessage(errorLoc, false);
	otherO = document.getElementById(other);
	if (object.value.length < 1) {
		showMessage(errorLoc, true);
		if(critic) return false;
	}
	if (otherO.value.length < 1) {
		showMessage(errorLoc,true);
		if(critic) return false;
	}
	
	return true;
}

function checkSame(object,ref,errorLoc,critic) {
	showMessage(errorLoc, false);
	refO = document.getElementById(ref);
	if (object.value != refO.value) {
		showMessage(errorLoc, true);
		if(critic) return false;
	}
	
	return true;
}

function checkEmail(object,errorLoc,critic) {
	showMessage(errorLoc, false);
	if(!emailCheck(object.value)) {
		showMessage(errorLoc, true);
		if(critic) return false;
	}

	return true;
}

function emailCheck (emailStr) {
	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) {
		return false
	}
	var user=matchArray[1]
	var domain=matchArray[2]
	
	if (user.match(userPat)==null) {
			return false
	}
	
	var IPArray=domain.match(ipDomainPat)
	if (IPArray!=null) {
			for (var i=1;i<=4;i++) {
				if (IPArray[i]>255) {
					return false
				}
			}
			return true
	}
	
	var domainArray=domain.match(domainPat)
	if (domainArray==null) {
		return false
	}
	
	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>3) {
	 return false
	}
	
	if (len<2) {
		 return false
	}
	
	return true;
}