function checkEmailForm(form) {
	
	if (!checkEmail(form.Email.value)) {
		alert('Please enter a valid email address.');
		form.Email.select();
		form.Email.focus();
		return false;
	}
	
	
	return true;
	
	}
	
	function checkEmail(email) {

			var at="@"
			var dot="."
			var lat=email.indexOf(at)
			var lemail=email.length
			var ldot=email.indexOf(dot)
			
			if (email.indexOf(at)==-1)
			return false;
			

			if (email.indexOf(at)==-1 || email.indexOf(at)==0 || email.indexOf(at)==lemail)
				return false;

			if (email.indexOf(dot)==-1 || email.indexOf(dot)==0 || email.indexOf(dot)==lemail)
				return false;
			
			if (email.indexOf(at,(lat+1))!=-1)
				return false;
			
			if (email.substring(lat-1,lat)==dot || email.substring(lat+1,lat+2)==dot)
				return false;
			
			if (email.indexOf(dot,(lat+2))==-1)
				return false;
			
			if (email.indexOf(" ")!=-1)
				return false;
			
 			return true;			
		}