function setup(){
var butn=document.getElementById('sendit');
butn.onclick=checkForm;
}


function checkForm(){

var firstName=document.getElementById('firstname');
var secondName=document.getElementById('surname');
var address=document.getElementById('email');
var grade=document.getElementById('grade');
var error=document.getElementById('errortext');
var errorMsg='';
var valid=false;
firstName.style.backgroundColor='#ffffff';
secondName.style.backgroundColor='#ffffff';
address.style.backgroundColor='#ffffff';



if(firstName.value==''){
	errorMsg= 'Please supply your first name';
	firstName.focus();
	firstName.style.backgroundColor='#0099ff';
	}else if(secondName.value==''){
	errorMsg= 'Please supply your second name';
	secondName.focus();
	secondName.style.backgroundColor='#0099ff';
	}else if(address.value==''){
	errorMsg= 'Please supply a valid email address';
	address.focus();
	address.style.backgroundColor='#0099ff';
	}else{
	valid=true;
}

if (errorMsg !==''){
	error.innerHTML=errorMsg;
	error.style.color='#0099ff';
	}
	return valid;
}

if (document.getElementById){
	window.onload=setup;
}