function submitform()
{
		var emailfilter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;

	if (!document.contact.name.value) {
		alert('Please enter your name') 
     	document.contact.name.focus(); 
     	return false; 
	}	else if (!document.contact.tel.value) {
		alert('Please enter your telephone number') 
     	document.contact.tel.focus(); 
     	return false; 

	}	else if (!document.contact.email.value) {
		alert('Please enter your email address') 
     	document.contact.email.focus(); 
     	return false; 
	}else if (!emailfilter.test(document.contact.email.value)) {
		alert('Please enter your email address') 
     	document.contact.email.focus(); 
     	return false; 
	} else {
		return true;
	}
}