function checkRequired(form){
	if (form.image.value==''){
			show('warning');
		return false;
		}
	return true;
}

function show(id)
{
    var o = document.getElementById(id);
    if (o)
        o.style.display = 'block';
}

function hide(id)
{
    var o = document.getElementById(id);
    if (o)
        o.style.display = 'none';
}