function Exists(myEntry)
{
        var aCharExists = 0;
        var entry = myEntry;

        if (entry)
        {
                for (var i = 0; i < entry.length; i++)
                {
                        if (entry.charAt(i) != " ") aCharExists = 1;
                }
        }
        if (!aCharExists) return 0;
        return 1;
}

function checkForm(form) 
{
	var error = "";
	if (!Exists(form.USER_NAME.value)) 
		error += "Please enter your username.\n";
	if (!Exists(form.EMAIL.value)) 
		error += "Please enter your e-mail.\n";

	if ( error == "" )
		return true;
	else {
		alert(error);
		return false;
	}
}